This is a suit under R.S. 4915, 35 U.S.'C. A. § 63, in which a patent is sought for a lubricating composition.1 From a judgment of the United States District Court for the District of Columbia dismissing the complaint, plaintiffs (appellants) take this appeal.
Appellants’ basic claim is stated as follows:
“Claim 8: A lubricating composition comprising a major amount of a hydrocarbon lubricating oil and the combination of (a) a detergent and (b) a sulphur-containing inhibitor in such an amount and with the sulphur in such form that more than 0.01% of sulphur, based on the weight of the lubricating composition, will react with copper at 250° C. and less than 0.001% at 100° C.”
The remaining claims in suit relate chiefly to the composition of the detergent and of the sulphur-containing inhibitor.2 It appears that detergents are used in engine oils and similar lubricants in order to keep the bearings and other working parts free from deposits caused by the breaking down of the lubricant under conditions óf use. It also appears that sulphur is used as an ingredient of the lubricant in order to bring about the formation of a sulfide film on the working parts; this has the effect of protecting the bearing surfaces from corrosion as well as providing a degree of protection *342against injury to the working parts in operation. There would also appear to be a facilitation of the friction-preventing process.
The essential point which appellants urge is that their formula provides a definition of the amount of sulphur to be added and specifies the narrow range of that amount. Their brief says, in this respect:
“The use of detergents broadly in .lubricants is not new nor is the use of sulphur or sulphur compounds new.- The Appellants’ composition is believed to be novel and not anticipated by the prior art in two-respects :
“First, no one prior to the Appellant Prut-ton ever taught the use of a lubricant which contains sulphur in the character and amount specified; and
“Second, no one prior to the Appellant Prutton ever proposed the combined use with such character and amount of sulphur, of a material which functions as a detergent.”
The District Court in its findings of fact listed a number of patents as disclosing significant aspects of the prior art,3 and concluded: “13. It would not require invention in view of the disclosures of each of [the patents to] Rutherford et al., Shoemaker et al. or Salzberg, to replace the corrosion inhibitor of Morway o-r Wilson by a sulfur containing inhibitor of the kind defined in the claims here involved.”
The issues presented are thus quite similar to those involved in Asseff v. Kingsland, 85 U.S.App.D.C. 367, 178 F.2d 710, and in Asseff v. Marzall, 88 U.S.App.D.C. 358, 189 F.2d 660. Much of the background of the art is disclosed in the opinions rendered in those cases.
In considering the present case, it appears desirable first to’review certain of the earlier patents in the field — those to Morway, Salzberg and Shoemaker.4 The Morway patent disclosed the combination of a detergent with sulphur compounds in a lubricating composition, adding that “Corrosive sulphur is preferred to the non-corrosive types and the word ‘corrosive’ is used in a special sense to describe that type of compound, including free sulphur, which is capable of discoloring .a bright copper strip when applied according to- the method ordinarily used for testing gasoline and described by the American Society fo-r Testing Materials.” (Pat. No. 2,109,779, p. 1, col. 2, li. 28-36.) Salzberg disclosed the use in lubricants of new esters of the thio (sulphur) acids of phosphorus, stating, in part, that “the sulphur content of our compounds renders them more effective for many technical applications than the corresponding phosphates containing no sulphur; for example, when employed as * * * inhibitors. Furthermore, our compounds are more desirable as assistants for use in extreme pressure lubricants * * (Pat. No. 2,063,629, p. 3, col. 2, li. 60-68) The Shoemaker patent discloses that corrosion of hard metal alloys may be inhibited in refined lubricating oils by the use of sulphur in the form of alkyl or aryl thiophosphite, the recommended amount being up to 2% but preferably, 0.05% to 0.75%. (Pat. No. 2,191,996, p. 1, col. 1, li. 38-45)
The three patents just discussed had all been applied for or actually granted by November 23, 1936, many months prior to the earliest date on which Dr. Prutton (the original applicant here) claims to-have reduced to practice his present formula,5 and long prior to the actual filing of his present application on October 27, 1941. These patents, taken together, clearly showed the usefulness in lubricant formulas of detergents and of sulphur-containing corrosion inhibi*343tors.6 Appellants must therefore urge some new factor. This they do by contending that their formula teaches the use of sulphur of prescribed character in prescribed amounts, on a controlled-activity basis.
The record shows that if the sulphur used as an inhibitor is in too active a form it will react with bearing surfaces at comparatively low temperatures — sometimes even while the machine is at rest. This produces undesirable results. Appellants specify that under their formula, at the temperature of boiling water (100° C.) less than 0.001% of sulphur, based on the total composition, will react with copper; at 250° C., however, more than 0.01% of sulphur will react with copper. High reactivity is thus obtained at high operating temperatures.
Appellants rely heavily on the “control” aspect of their formula, pointing out that some compounds contain sulphur in such an active form that reduction in its activity is required. But in his testimony Dr. Prut-ton stated that “you can usually treat those materials with either an alkaline material —-caustic soda, lime, sodium sulfide — and in that way reduce the reactivity at the lower temperature, and take out from the compound that very active sulphur which might be present as an impurity, and which is not desired.” He added that these methods are “quite well” known in the art.7
In essence, Dr. Prutton’s teaching is that sulphur is a seasoning which must be used with care, and preferably in such form and amount as will produce the results desired— i. e., little or no reaction with a cold engine and substantial reaction with a hot engine, tie prescribes that when a lubricating formula is made up it he tested and experimented with (according to stated methods) to make certain that it does in fact meet the stated standards of performance.
The description of these standards, and the formulation of these tests,8 may be assumed to be a useful contribution to industrial knowledge. But that is not enough to entitle appellants at this stage to preempt the lubricating field to the extent and in the manner they seek. There is no> showing that others in the field have not themselves been formulating their own standards of performance and making tests of their product against those standards. It is hardly to be contemplated that every time a user of the Morway patent (for example) reaches optimum performance under standards akin to those of appellants (i. e., no sulphur reaction with a cold machine, substantial reaction with a hot) he must be found to have infringed the appellants’ claims. That would be to carve the heart and value out of the pre-existing knowledge and work in the field. In fact, Morway did not contemplate that the use of sulphur would be uncontrolled. He gave a special definition of the sulphur to he used, and provided for activity tests. Only a portion of the sulphur used by Morway was to be in the so-called “corro-sive” form. He gives special emphasis to the use of polysulfides, as well as sulphurized olefines and terpenes. (Pat. No. 2,109,779, p. 1, col. 2, li. 37 et seq.)
On consideration of the entire record we must conclude that the District Court was correct in finding that “It would not require invention in view of the disclosures of each of * * * Shoemaker et al. or Salzberg, to replace the corrosion inhibitor of Morway or Wilson by a sulfur containing inhibitor of the kind defined in the claims here involved.” 9
*344In view of this conclusion, we must hold that the complaint was properly dismissed. See Asseff v. Kingslaind, supra; Asseff v. Marzall, supra. Accordingly, we need not examine the other patents referred to by the District Court (Asseff, Mulit, McNab and Wilson10), or reach the other contentions of the parties.11
. The judgment of the District Court will therefore be
Affirmed.,