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:
Apr. 09, 1985
Filed:
Dec. 20, 1983
Applicant:
Inventor:
Gustav Gutman, Lake Elmo, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430619 ; 430620 ;
Abstract
Thermally developable light sensitive material containing a light sensitive silver halide, an oxidizing agent, a reducing agent, and a combination of 2-(hydroxymethyl)-1(2H)-phthalazinone as a toning agent precursor and certain polycarboxylic acids or derivatives thereof as a catalyst for said toning agent precursor. Upon heat development of the exposed photothermographic material, the 2-(hydroxymethyl)-1(2H)-phthalazinone decomposes to form phthalazinone. The thus-formed phthalazinone acts as a toning agent for the light exposed silver halide.