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. 28, 2009
Filed:
Apr. 14, 2005
Louis Ferrero, Nice, FR;
Leonhard Zastrow, Monaco, MC;
Karin Golz-berner, Monaco, MC;
Norbert Groth, Waldesruh, DE;
Thomas Herrling, Berlin, DE;
Louis Ferrero, Nice, FR;
Leonhard Zastrow, Monaco, MC;
Karin Golz-Berner, Monaco, MC;
Norbert Groth, Waldesruh, DE;
Thomas Herrling, Berlin, DE;
Coty B.V., Haarlem, NL;
Privatinstitut fuer Dermatologische Produktforschung Galenus GmbH, Berlin, DE;
Abstract
The invention relates to a method for determining an integral sun protection factor (∫ SPF or iSPF) which encompasses both UVA and UVB radiation and can be used for classifying cosmetic and dermatological sunscreens. The method comprises the steps of applying a defined amount of the sunscreen onto a defined area of a skin substrate impregnated with a spin trap, exposing the skin substrate to a defined amount of UVA- and UVB rays by a sun simulator, subjecting the skin substrate exposed to radiation to an electron spin resonance (ESR) measurement, recording the number of free radicals trapped as a real number×10free radicals/mg of skin sample, and determining the integral sun protection factor ∫ SPF according to the equations (1) and (2) and (8)