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United Kingdom House of Lords Decisions
You are here: BAILII >> Databases >> United Kingdom House of Lords Decisions >> Henderson v. Clippens Oil Co. (Ltd) and Another [1883] UKHL 423 (23 February 1883)
URL: http://www.bailii.org/uk/cases/UKHL/1883/20SLR0423.html
Cite as: 20 ScotLR 423, [1883] UKHL 423
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SCOTTISH_SLR_House_of_Lords
Page: 423↓
House of Lords.
(Before The
v.
Subject_Patent — Specification — Combination.
Facts:
A patent was obtained for improvement in the destructive distillation of shale, &c., and in apparatus therefor. The specification stated that the invention “has for its object the economical and satisfactory obtainment and application of the heat required for the destructive distillation of shale, &c., and it comprises improved arrangements for the utilisation of the spent shale, &c., itself as fuel for supplying the heat or a portion thereof.”
The claim in the specification was for “(1) the conducting of the destructive distillation of shale, &c., substantially according to and by means of the arrangements and apparatus hereinbefore described; (2) the arranging of two or more retorts in one oven, but with a separate passage or space for the transference of the contents of each retort directly into a common fire-chamber substantially as hereinbefore described; (3) the applying of a valve in the passage or space through which the contents of each retort are transferred to the common fire-chamber, such valve being in addition to the door or cover which closes the discharge-opening of the retort substantially as and for the purpose hereinbefore described.”
The object of the invention was to utilise the spent shale as fuel without loss of heat, by passing it after distillation from the retort into the furnace without exposure to the air. This was accomplished by means of an arrangement of the doors of the retorts in relation to corresponding doors in the roof of the fire-chamber, which prevented the heat in the retorts from becoming too great, and also the door opening out of the retorts from being destroyed by excessive heat.
In a question of infringement of patent— held ( aff. judgment of Second Division) that what the specification described and the patent was obtained for was a certain novel and useful arrangement of apparatus for the purpose of managing the heat for distillation, and utilising for that purpose the spent shale, the essence of which arrangement was the placing and working of the doors in the retort and fire-chamber in a certain manner; (2) that the use of the common fire-chamber was on a proper construction of the specification not claimed as essential to the invention, but was only an incident of it, and therefore, (3) that an arrangement of apparatus which was substantially the same as that patented except that no common fire-chamber was used, was merely a colourable imitation of that of the patentee, as described by him and claimed under the first clause of his claim.
This case is reported 3d December 1881, ante, vol. xix., p. 183, and 9 R. 232.
The respondents in the process of interdict (the Clippens Oil Company, Limited, and William Young) appealed to the House of Lords.
Counsel for respondents (complainers in Court below) were not called upon.
At delivering judgment—
Page: 424↓
My Lords, as I read the specification anterior to the claims, the result at which I arrive is this. It describes a certain arrangement of apparatus for the purpose of better conducting the heat for distillation, and for that purpose utilising the spent shale. That is the main object of the whole specification. It describes certain things which, as it appears to me, contain the substance—the indispensable substance—of the invention, and certain other things which are useful and important, but not necessary accessories or modes of carrying it into effect, and the claims, as I understand them, both generally cover that which in my view is described as the substance of the invention as a whole, and also specifically claim certain combinations, of which one, as I view it, is, and the other is not, a necessary and indispensable part of the invention.
The argument addressed to your Lordships has really been this, that what the appellants have done being in all other respects I may say confessedly an adoption of the respondent's process and apparatus is not an infringement, because there is not a common fire-chamber into which two or more retorts discharge the shale. My Lords, without at all going into any minute question as to the manner in which the products of combustion reach the oven, or the possible communication between one of the appellants' fire-chambers and another, I will take it to be strictly as the appellants contend, that what they do is to discharge from each retort the spent shale into a separate chamber, and that there is no common fire-chamber within the meaning of the respondent's patent used by them. On that ground they say there is no infringement. Now, for the purpose of seeing whether that is a sufficient ground for holding that there is no infringement, it becomes necessary to consider whether according to the true construction of the respondent's patent the first claim involves as a necessary ingredient this common fire-chamber with two or more retorts discharging into it, and then, if it do, whether the third claim also necessarily involves this common fire-chamber. I am disposed to think that the second claim does involve a common fire-chamber, and therefore that under the second claim, taken alone, that which does not involve the use of a common fire-chamber might not be held to be an infringement. I do not think, my Lords, it is necessary for your Lordships to decide that point, but I, for the purpose of the observations which I wish to address to your Lordships, will make this concession. The second claim is “the arranging of two or more retorts in one oven, but with a separate passage or space for the transference of the contents of each retort directly into a common fire-chamber substantially as hereinbefore described.” With regard to that claim as covered and protected by the patent, namely, that arrangement of two or more retorts with a common fire-chamber, I concede that that particular claim applies only to a combination of which a common fire chamber with two or more retorts is an essential part, and therefore that it is not under that claim that the present allegation of infringement can be made out. I repeat, my Lords, that I do not ask your Lordships so to decide if there is any doubt in any of your Lordships' minds upon the point, but I am content so to assume for the purpose of the opinion which I myself wish to express.
But there remains a question, whether the system mentioned in the general terms of the first claim is a system of which a common fire-chamber with two or more retorts discharging into it is upon the true construction of the specification an essential and indispensable part. My Lords as I read the specification, I think it is not—that is to say, I find in the specification mention indeed made of this discharge of two or more retorts into a common chamber as a thing exceedingly useful and important for the purpose of producing the best results under this patent, but I also find words which satisfy me that it is not described as essential and indispensable to the system, and if therefore the rest of the system as described in the specification is capable of application where those conditions are not found, I think that such an application will be an infringement, although a much better way of doing the thing is to use also that combination which is covered specifically by the second claim.
My Lords, my reasons for the opinion which I have expressed are these—I find that “a series of four vertical retorts arranged in a furnace chamber or oven” (that is, in substance, in a common fire-chamber) is first mentioned as being “according to one modification” of the invention; as far, therefore, as that is concerned I do not find sufficient to justify the conclusion that it is necessary or indispensable. The mention of “one modification” implies that there may be other modifications of this description, but it is so introduced. But that is not all, because, my Lords, I find again that “the arranging of one fire-chamber in connection with two or more retorts as hereinbefore described” is said to be “of great importance in carrying out the invention, as is also the discharging of the retorts at different periods and in regular rotation; as with these arrangements the aggregate heat acting is rendered more uniform and regular,” and so forth It is then said that the mid-partition which is a part of this furnace is of advantage in preventing too intimate a mixture and consequent choking of the materials. From that it is manifest to me that three things are mentioned, namely, the mid-partition, the regular rotation of discharge, and the arranging of one fire-chamber in connection with two or more retorts, which has been previously called one modification of the system. They are all put upon the same footing as things of great importance in order to attain the most successful results, but from the words which are used I should certainly infer that they are not indispensable to the use of the general system which has been described before, however desirable they may be in order to produce, as I say, the best results from it.
I am confirmed in that view, my Lords, by a passage upon the context of which very considerable argument was founded—I mean the passage in which the patentee speaks of the possibility of
Page: 425↓
Therefore, my Lords, the result is this, that laying aside the part of the description and of the specification which relates as I said at the outset to that which the patentee at present believes to be the best practicable arrangement and apparatus, the essence of the invention consists in the arrangement of which the description begins—“The bottom of each retort is formed,” and so forth going on with the account until we come to the situation of the retort bottom as in “a casement or space made with an iron framing fixed in the building and with its inner end opening into the fire-chamber, which is also open on its outer side,” and which description I do not read in detail to your Lordships as it has been read more than once. That is the essence of the invention—the mode in which the fuel is introduced by being so discharged into the chamber in which the fire is as to produce those improvements in the distillation of the oil which are the subject of the patent.
My Lords, it appears to me that the whole substance—though not in all respects the form, because the details are not essential—but that the whole substance of the arrangement of the two valves, either of them being in a casement or space made with a framing fixed in the building, and having those effects which are here described—the whole substance with only immaterial variations of it—is here given, and that appears to me to be all that is essential to the system, and the arrangements and apparatus described in the specification, and which are the subject of the first claim.
Under, therefore, the first claim it appears to me that the infringement is made out, and that makes it not really necessary to consider the remaining claims. I have said that I do not at present myself think that you can disengage the common fire-chamber and the plurality of retorts from the second claim, and therefore that in this case there is not an infringement of that particular claim. The object of that claim, added to the first claim, is to separate that which is useful but not indispensable, and at the same time which is new, from the general system and make it the subject of a distinct claim. And I think, my Lords, that the object of the third claim is to be taken in the same manner as that which in my view is indispensable to the general system mentioned, namely, the arrangement of the retorts with an intervening passage or space (which is an essential part of the apparatus) “substantially as hereinbefore described.” It is true that some possible difficulty may seem at first sight to arise in the construction of that third claim from the manner in which the words “the common fire-chamber” are there used—“The applying of a valve in the passage or space through which the contents of each retort are transferred to the common fire-chamber, such valve being in addition to the door or cover which closes the discharge opening of the retort substantially as and for the purposes hereinbefore described.” But, my Lords, I cannot but think that the substance of that claim is disengaged from the common fire-chamber, and that the common fire-chamber is there mentioned merely as the thing which is shown upon the drawings into which, according to the plan recommended by the patentee, the contents of the retorts are to be transferred. The thing which really is of the essence of that claim is “the applying of a valve in the passage or space through which the contents are transferred, which valve is additional to the door which closes the discharge opening of the retort “substantially as and for the purposes before described.” It appears to me that the essential things are these valves, and that the arrangements which are described as being provided for their use are independent of the common fire-chamber although they are shown upon the drawings with such a fire-chamber. If therefore it had been necessary to rely upon that third claim, I should have been prepared to hold that the infringement was made out under it. It is not, however, my Lords, in my view necessary to do so, because I am of opinion that the infringement is sufficiently made out on the true construction of the specification as a whole under the first and more general claim.
I therefore move your Lordships to dismiss this appeal with costs.
Now, my Lords, I think it very important to keep in view that, as I read this instrument, from the beginning to the end of it the patentee discloses as the object and at the same time the merit of his invention an improved method of
Page: 426↓
But, my Lords, when we come to consider what is the claim here, I cannot assent to the able argument addressed to your Lordships by the appellants, to the effect that under the first head of the claim the patentee includes nothing except a combination containing as one of its parts a single fuel or fire-chamber. No doubt in the detailed description which he gives of one of the best modifications, if not the best modification, of his patented apparatus, he shows a single fire-chamber; but I can find nothing in the language of that description indicating that it is a necessary part of the combination or so material a part of the combination that if it was dispensed with and two single fire-chambers were introduced instead of one entire fire-chamber with a mere division of the fuel, the apparatus would no longer represent that which the patentee intended to be the subject of his invention. There is nothing in the words of the description of this modification to exclude a modification which would consist of converting the chamber into two chambers by carrying up the mid-partition to the top; and I think that the reference which the Noble Lord on the woolsack made to the passage, with regard to the conversion of existing vertical retorts with furnaces below into the patented apparatus, is perfectly conclusive upon this point, and that if the patentee has not elsewhere in the patent used language to exclude that claim, he does there in point of fact claim as within the patent the central part of the apparatus—a combination containing other than a single fire-chamber. The description which he gives there of the operation necessary to convert the then known and existing vertical retorts none of which had been erected over a common fire-chamber, conclusively shows that as soon as a slight external erection is put up representing the central part, the casement with its adjustment, that becomes, according to the claim in this patent, one of the patentee's modifications. Accordingly I am of opinion that it is quite impossible, in that reading of the first claim of the patent, to look at the one apparatus and at the other without seeing that an infringement of this invention has taken place.
Then, my Lords, with the second claim it becomes unnecessary to deal; it appears to me to be a claim for a special combination in which the common fire-chamber is a prominent feature. I do not think it necessary to discuss, still less to decide, what the effect would be in any question between the two parties if the case turned upon that claim.
In regard to the third claim, although the construction of it is attended with considerable difficulty, I am of the same opinion as the noble and learned Lord who has addressed your Lord—ships. I humbly think that the purpose of the patentee in framing that claim disclosed in the language which he uses was to claim a particular application of a valve to the furnace and the heat-chamber separately from the other parts of the combination; in any other view the claim would really be futile. That is not a sufficient answer, but I think that it may be intelligibly and intelligently read as meaning a claim for the application of a valve in the passage or space, however it is used, for the purpose of performing the same function as between the retort and the furnace which the casement supplies in the apparatus described; and accordingly it appears to me that, even if the respondent's case had failed upon the first head of the claim, what has been done by the appellants would have been obnoxious to the third; but I think that the judgment of the Court below was sustainable upon either of these two heads of claim.
Then it is said that that which was done at Fulham was an anticipation of the pursuer's invention. Now I cannot think that it was, and it is not for those who entertain that opinion to give any reason; all I can say is that it does not
Page: 427↓
That being so, the only remaining question is whether there has been an infringement, as to which, if the common chamber is but a part of the claimant's invention, it stands confessed that there has been an infringement, and upon the testimony most relied upon by the defenders.
I think, therefore, that the appeal should be dismissed.
Interlocutor appealed from affirmed and appeal dismissed with costs.
Counsel for Appellants—Solicitor-General ( Herschell, Q. C.)— Webster, Q.C.— Macrory—Agents— Grahames, Currey, & Spens— Webster, Will, & Ritchie, S.S.C.
Counsel for Respondents—Lord Advocate ( Balfour, Q.C.)— Asher, Q.C. Agents — A. Beveridge— Philip, Laing, & Co., S.S.C.