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:
Nov. 14, 1995
Filed:
Apr. 02, 1993
Tetsuo Nakatsu, Walnut Creek, CA (US);
Kok Lean Kang, Oakland, CA (US);
Kelly L McAlister, both Conrad, CA (US);
Jiansheng Huang, both Conrad, CA (US);
Takasago Institute for Interdisciplinary, Walnut Creek, CA (US);
Abstract
Methods and compositions are provided for inhibiting the activity of tyrosinase in a host and, as a result, inhibiting melanin-formation. The tyrosinase-inhibitor active ingredient is a compound or mixture of compounds represented by the following structural formulae (I) and (II): ##STR1## wherein the dotted lines at a, b, c, d, e, f, g, represent an optional double bond, provided that double bonds are not at both b and c, or at both f and g, at the same time; R.sup.1, R.sup.5, R.sup.6, and R.sup.7 are each hydrogen or methyl; R.sup.2 and R.sup.8 are each no group, or each hydrogen or hydroxyl when there is no double bond at a and at f, respectively; R.sup.3 is methylene when there is a double bond at b, or hydrogen or methyl when there is no double bond at b; R.sup.4 is formyl or --(CH.sub.2).sub.n --R.sup.10, wherein R.sup.10 is hydrogen, hydroxyl, acyloxy, or cyano and n is an integer of from 1 to 3; and R.sup.9 is methylene when there is a double bond at g, or --(CH.sub.2).sub.n --R.sup.10 when there is no double bond at g.