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. 23, 1993
Filed:
Dec. 05, 1986
Applicant:
Inventors:
Edward J Dombrowski, Jr, Allston, MA (US);
James R Freedman, Newton Centre, MA (US);
Patrick F King, North Quincy, MA (US);
Assignee:
Polaroid Corporation, Cambridge, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ; G03C / ; B41M / ; B41M / ;
U.S. Cl.
CPC ...
430338 ; 430332 ; 430341 ; 430342 ; 430343 ; 430346 ; 430348 ; 430350 ; 430363 ; 430944 ; 430964 ; 430618 ; 430619 ; 430620 ; 503201 ; 503204 ; 503218 ; 503220 ; 503221 ; 503224 ; 503226 ;
Abstract
This invention relates to novel recording materials which employ color-forming di- and triarylmethane compounds possessing certain S-containing ring-closing moieties, namely, or thiolactone, dithiolactone or thioether ring-closing moiety and to a method of forming color by contacting these dye precursor compounds with a Lewis acid material capable of opening the thiolactone, dithiolactone or thioether ring-closing moiety whereby the compound is rendered colored, that is, converted to its chromophore color.