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. 06, 1999
Filed:
Apr. 23, 1993
Paulina P Garcia, Arlington, MA (US);
John W Lee, Still River, MA (US);
John L Marshall, Somerville, MA (US);
Donald A McGowan, Bedford, MA (US);
Anthony J Puttick, Arlington, MA (US);
Thomas K Spencer, Lexena, KS (US);
Stephen G Stroud, Medford, MA (US);
Stephen J Telfer, Arlington, MA (US);
Michael J Zuraw, Arlington, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
Squarylium compounds of the formula: ##STR1## wherein Q.sup.1 and Q.sup.2 are each independently a pyrylium, thiopyrylium, selenopyrylium, benzpyrylium, benzthiopyrylium or benzselenopyrylium nucleus, and R.sup.1 and R.sup.2 are each independently an aliphatic or cycloaliphatic group, can be prepared by reacting a squaric acid derivative of the formula: ##STR2## with a compound of the formula Q.sup.2 CH.sub.2 R.sup.2 in the presence of a base.