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. 02, 1991
Filed:
Apr. 27, 1989
Applicant:
Inventor:
Kary B Mullis, La Jolla, CA (US);
Assignee:
Xytronyx, Inc., San Diego, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J / ; G03C / ;
U.S. Cl.
CPC ...
2504741 ; 430338 ; 430340 ; 430346 ; 2504821 ;
Abstract
Photochemical systems for the direct visualization of exposure to ultraviolet radiation that effect visible color changes involving a process in which a photoacid is formed upon irradiation of a nitro-substituted aromatic aldehyde with ultraviolet light and wherein proton transfer to a dye causes the dye to undergo a visible color change. The system undergoes such color change to an extent directly proportional to the cumulative amount of ultraviolet incident thereupon.