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:
Mar. 19, 1996
Filed:
Sep. 27, 1994
Shiseido Company, Ltd., Tokyo, JP;
Abstract
Provisions are made so that an SPF value having high correlation with an in vivo SPF value can be calculated in vitro using a common calculation equation regardless of the material type used. Transmitted UV intensities I(.lambda.) are corrected by respective erythemal effectiveness coefficients EE(.lambda.) to calculate an erythema-inducing UV intensity EUI, and the elements of I(.lambda.) from .lambda.=320 to 400 nm are summed to calculate a transmitted UV-A intensity; then, from the ratio UV-A/EUI, a theoretical value .alpha..sub.TH is calculated for the base .alpha. of a photoaugmentative effectiveness .alpha..sup.UVA, and using EUI.times..alpha..sub.TH.sup.UVA, an ultimate theoretical value EUI.sub.UL of EUI is calculated. When EUI.sub.UL is larger than 75, the SPF value is calculated from 1350/EUI.sub.UL ; otherwise, the SPF value is calculated using an empirical equation.