The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 1977
Filed:
Jan. 16, 1976
Alfred Halpern, Great Neck, NY (US);
Ernest J Sasmor, Yonkers, NY (US);
Synergistics, Inc., New York, NY (US);
Abstract
Alkyl esters of aminosalicylic acid, said alkyl group having from 1 to 18 carbon atoms in chain length; alkenyl esters of aminosalicylic acid, said alkenyl group selected from the group consisting of vinyl, allyl, undecenyl, oleyl and linolenyl groups, and cyclic esters of aminosalicylic acid, said cyclic group being the cyclohexyl, phenyl and menthyl groups, having ultra-violet screening properties to absorb light rays within the wave-length range of 2950 A. to 3200 A. while transmitting the light rays beyond the 3200 A. range to permit the desirable tanning of the skin without solar burn. The respective esters of aminosalicylic acid are prepared by the reduction of the appropriate nitro-salicylic acid ester with Raney nickel and hydrogen in the presence of ethyl acetate. The respective esters are obtained as oils or solid crystalline substances and are soluble in alcohols, chloroform, acetone and benzene but insoluble in water. The ultra-violet absorption spectra for the respective compounds are described. Compositions comprising the above compounds together with the method for their preparation and the method for the use to achieve an ultraviolet filtering action on the skin of humans and animals are described.