Yes, an applicant for apatent may file a provisional specification which need not be full and specific. It is sufficient if it contains a general description of the invention, its field of application and the anticipated results. It need not contain a claims. The object is to fix the priority date of the patent. Where a provisional specification is field the applicant gets a maximum period of 15 months to file the complete specificatopn. During this period he may conduct further research on the subject matter of his invention and perfect the method of carrying out the invention or introduce furthjer developments or addition to the invention which he may incorporate in the complete specification and the claims.