majority">Bland, Judge,

delivered the opinion of the court:

This appeal involves a single claim numbered 7, the only claim in appellant’s application. It reads:

7. An insecticide containing as its essential active ingredient substantially pure gamma, gamma-dipyridyl.

*960As indicated by the claim, the substance is for use in combating insect infestation on vegetation, and it appears that it may be applied in either liquid or dust form.

The applicant appears to be a scientist employed by the United States Department of Agriculture, and the application, filed March 31, 1941, was made under the provisions of law governing patent applications by Government employees.

The examiner rejected the claim as being unpatentable over the disclosure of a publication, issued by the Department of Agriculture in October 1926, entitled “Toxicity of Dipyridyls and Certain Other Organic Compounds as Contact Insecticides.” The Board of Appeals affirmed the decision of the examiner and the instant appeal to this court followed.

The publication cited appears to have been prepared by Charles H. Richardson and C. R. Smith, scientists in the employ of the department, and it is hereinafter referred to as the Richardson et al. article. It is identified in the statement of the examiner as appearing in the “Journal of Agriculture Research, Yol. 33, pages 597-609 (1926).”

Neither the examiner nor the board quoted the text of that part of the Richardson et al. article which was regarded as anticipatory In his statement following the appeal to the board the examiner said:

The claim is rejected as directly met by the Richardson et al. publication. Richardson et al. teach the use of dipyridyls generally and give specific attention to gamma, gamma-dipyridyl. Applicant urges that this is not a reference as Richardson et al. show that the gamma, gamma-dipyridyl is not as effective as the others, and will, in fact, dilute the toxic effect of the other dipyridyls. This teaches that the concept of using gamma, gamma-dipyridyl as an insecticide is old. It does not necessarily, as applicant urges,-show that gamma, gamma-dipyridyl is not useful as an insecticide. It simply shows that gamma, gamma-dipyridyl is not as toxic to the insects tested as the other dipyridyls. In regards to applicant’s ■ arguments that he has produced an invention by reversing the teaching of the prior art, attention is directed to In re Golin, 538 O. G. 5.

In the course of its decision tbe board said:

The subject matter in issue is an insecticide consisting mainly of gamma, gamma-dipyridyl. The appealed claim stands finally rejected on the publication cited above. There are six dipyridyls which are fully discussed in the article cited. The authors of this article made a general survey with regard to the use of these isomers as possible insecticides. Judging from the statements made at the bottom of page 599 and at the top of page 609 the gamma, gamma-dipyridyl was not considered as effective an insecticide as the others mentioned.

It is difficult to see wherein there could be any invention involved in the subsequent discovery that the gamma, gamma-dipyridyl was effective as an insecticide. The reference shows that the substance per se was old and well known and its use as an insecticide was clearly contemplated by the authors of the article. At best all that appellant has done was to discover that under certain conditions not specified in the appealed claim the material would be effective.

*961In addition to the case of In Re Colin, 29 C. C. P. A. (Patents) 757, 124 F. (2d) 219, 52 USPQ 89, cited by the examiner, the board also directs attention to the case of In Re Thucm, 30 C. C. P., A. (Patents) 979, 135 F. (2d) 344, 57 USPQ 324, which was decided by ns subsequent to the decision of the examiner in the instant case, but prior to the decision of the board.

As stated in the board’s decision, six dipyridyls were discussed in the Richardson et al. article, one of them being the gamma, gamma-dipyridyls.

We have examined the article with much care in the effort to ascertain just what the experiments therein described disclose with respect to gamma, gamma-dipyridyl, and we here quote the statements deemed to be pertinent in this case. In the introduction it is said:

* * * A previous publication discussed the toxicity of some pyridine derivatives (8)2 and referred briefly to the compounds which form the subject of the present investigation. It was found in these experiments that impure yy dipyridyl was much more toxic than the purified substance, and it was later shown that these impurities consisted principally of isomeric dipyridyls. It is the purpose of this paper to report on the toxic value of these dipyridyls as contact insecticides. * * *

At a later point it is stated:

Oxidation of sodium dipyridine with moist air results in the formation of yy dipyridyl, the sodium atom and two hydrogen atoms being removed. Careful regulation of the temperature during the preliminary, sodiumpyridine digestion, followed by oxidation (with dry air or oxygen) of the sodium dipyridines thus formed, leads to the production of an oil which contains chiefly aa, pp, py, and yy dipyridyls. This crude dipyridyl oil, from which most of the yy dipyridyl was removed, was used in the experiments described below. * * *

Under the beading “PRELIMINARY EXPERIMENTS ON THE TOXICITY OF CRUDE -DIPYRIDYL OIL,” appears the following:

Studies on the toxicity of the dipyridyls as contact insecticides were begun'in August, 1920. The first indication of toxic action appeared when a crude mixture, the result of an attempt to produce yy dipyridyl, was found to be highly toxic to the bean aphis (Aphis rumiáis L.) at a concentration of 1 percent of the. mixture.3 Experiments soon demonstrated that purified yy dipyridyl was only slightly toxic, if at all, and that the mother liquor separated from it was even more poisonous to insects than the original mixture. * * *

Under the heading “METHODS OF APPLICATION OF CRUDE DIPYRIDYL OIL,” it is said: '

After a large number of preliminary experiments, a crude dipyridyl oil known to contain a variable mixture of aa, pp, and py dipyridyls was prepared for the toxicity experiments. * * *

Under the heading of “SUMMARY” the following statement appears:

*962act, /3/3, py, and yy dipyridyls, which occur in the crude dipyridyl oil used in these tests, were not so toxic to Aphis rumiáis as the crude oil itself; yy dipyridyl is much less toxic than the other three compounds.

It will be noted that in the said publication which formed the basis of the Patent Office rejection of the claim, it is stated that experiments soon demonstrated that purified gamma, gamma-dipyridyl was only slightly toxic, if at all, and that the mother liquor separated'from it was even more poisonous to insects than the original mixture. The publication does not disclose the details, such as+he percentage of water and that of pure gamma, gamma-dipyridyl, or the length of timé given for it to take effect, or many other possible details which properly could have been set out by the said Department .of Agriculture experimenters.

Agreeable to the Patent Office findings, it is at once apparent that substantially pure gamma, gamma-dipyridyl is not a new substance discovered by applicant, and that he was not the first to use it for the purpose of determining its value in combating insect infestation on vegetation. As was properly said by the board, the most that appellant has done was to discover that under certain conditions, not specified in the appealed claim, the material would be effective. It seems too clear to invite extended discussion that under such circumstances the appellant is not entitled to a patent claim for an insecticide which contains as its essential active ingredient, substantially pure gamma, gamma-dipyridyl.

Appellant sets out in some detail in his specification the conditions under which he used the substantially pure gamma, gamma-dipyridyl in determining its value as an insecticide. For instance, in one experiment he used 2 pounds to 50 gallons of water and obtained a mortality of 25.5 percent to codling moth larvae. He stated that this was not so good a result as when lead arsenate was used in the same concentration. He .discloses, however, that in another experiment he used 8 pounds of material to 100 gallons of water as a spray and obtained 62 percent mortality on 5th instar southern beet webworm after 6 days, and that when applied as a dust, he obtained a kill of 91 percent in 48 hours. He also tested the material as a spray against the 5th instar melon worm and obtained 96 percent kill in 4 days at a concentration of 8 pounds to 100 gallons of water. When applied as a dust, he obtained 96 percent kill in 12 hours. Other experiments showed that when the material was tested in different concentrations and under different conditions, he obtained splendid results on newly hatched screwworm, Hawaiian beet webworm, and European corn borer.

If appellant has made any invention, ,it rests in discovering the particular conditions under which substantially pure gamma, gamma-*963dipyridyl can be used successfully as an insecticide. If lie lias contributed to the insecticide art, it has been in that respect only. And, if lie is entitled to any patent protection for what he has done, the claim or claims of his application should have been drawn to cover that particular alleged advancement in the art.

We do not mean to suggest by the foregoing that had appellant submitted claims, the language of which covered the details of his experiments whic]i brought about the desired result, such claims would be allowable in the instant application. The subject of criticalness ivould be present; also, the presence or lack of invention in doing what appellant has done would be a matter for serious consideration. But whether or not appellant would be allowed claims which embrace the details of his successful experiments would necessarily involve the question as to whether, in view of the suggestion in the reference, appellant did anything more than to take a substance which was old, and which had been suggested as having in its pure form at least some toxic effect on some insect pests, and from such suggestion make experiments under different conditions until he had discovered a manner of utilizing the material profitably as an insecticide, and whether what he did involved anything more than that which one skilled in the art would ordinarily do.

It is true that appellant, in the instant claim, has not asked for a monopoly on pure gamma, gamma-dipyridyl for all purposes. He of course realizes that he is not the inventor of that material, and he has attempted to limit his proposed monopoly to the use of the material as an insecticide.

In view of our conclusion, we do not feel called upon here to enter into a discussion of the effect to be given to the introductory clause as calling for “An insecticide”. We feel certain that under the circumstances above enumerated, appellant is not entitled to a monopoly on substantially pure gamma, gamma-dipyridyl as an insecticide.

The tribunals below, we think, properly relied upon In re Golin, supra. In' that case, the applicant sought a patent on a mineral oil composition in which was incorporated an alkoxy-substituted aryl amine. The amine was old, and its utility had been tried in the same connection by others, who had reported their findings in an article in the publication Industrial & Engineering Chemistry. That was regarded by this court as a proper reference in denying the claims. The reference there taught that the use of the material was harmful rather than helpful, or at least that there were no beneficial results flowing from its use. In that case the applicant experimented and found that under certain conditions the material had utility. The reference article had suggested that a different result might be obtained under different conditions. This court held that the applicant *964was not entitled to a patent “on a composition or a process based upon its use merely because, by experimentation at certain temperatures and under certain conditions, lie has found that the substance rejected by the prior art has utility, when the claims presented contain no definite percentage of inhibitors or any other limitations or elements which lend patentability.” The court further said. “If appellant, by using p-anisidine in a certain critical percentage or at critical temperatures or under other critical conditions has discovered why Mead et al. [the authors of the reference article] had not found the material beneficial, his invention, if any, would rest in such discovery, and these critical conditions which brought about the useful results should be presented in the claims.” [Italics not quoted.]

It seems to us that that case is squarely in point, and the mere fact that appellant, in his specification, recites the conditions under which the experiments were made does not change the situation, because, after all, the claims of a patent should be the measure of the patent monopoly granted thereunder.

The case of In re TJmau, supra — particularly certain language used therein — we think also supports the conclusion we have herein reached.

The decision of the Board of Appeals is affirmed.

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