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. 13, 1990
Filed:
Dec. 07, 1989
Applicant:
Inventor:
Patrick F King, N. Quincy, MA (US);
Assignee:
Polaroid Corporation, Cambridge, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ;
U.S. Cl.
CPC ...
544278 ; 546114 ; 546 18 ; 549 50 ; 549 52 ; 549 55 ; 548407 ; 548454 ; 548464 ; 548440 ;
Abstract
This invention relates to a novel method of synthesizing di- and triarylmethane dye precursor compounds possessing a thiolactone ring-closing moiety, from the corresponding lactones.