32—The model must not be more than one foot in length, width or height, unless the Commissioner of Patents shall admit working models of complicated machines of larger dimensions.
33—Models belonging to patented cases will not be taken from the office except in the custody of a sworn employee especially authorized by the Commissioner of Patents.
SPECIMENS.
34—When the invention or discovery is of a composition of matter the applicant shall furnish a specimen of the composition and of its ingredients sufficient in quantity for the purpose of experiment.
35—In all cases where the article is not perishable a specimen of the composition claimed, put up in proper form to be preserved in the office must be furnished.
INTERFERENCES.
36—An interference is a proceeding instituted for the purpose of determining the question of priority of invention between two or more parties claiming substantially the same patentable invention or discovery.
37—If an application filed appears to claim substantially the same invention for which a caveat has been filed, the Commissioner of Patents will notify the caveator to complete his application in three months, and if upon the filing thereof it appears to be in conflict an interference will be declared. If the caveator fails to complete his application within the time designated, or such further time as for cause shown may be granted to him, the Commissioner of Patents will proceed to examine the first named application as if there were no caveat.
38—Each party to the interference will be required to file a concise statement under oath showing the date of his original conception of the invention, of illustration by drawing or model, of its disclosure to others of its completion and of the extent of its use.