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, 2007
Filed:
Aug. 11, 2005
Applicant:
Ponnampalam Mathiaparanam, Appleton, WI (US);
Inventor:
Ponnampalam Mathiaparanam, Appleton, WI (US);
Assignee:
Appleton Papers Inc., Appleton, WI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 307/94 (2006.01); C07D 493/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention teaches an improved process for the manufacture of useful fluoran dyes of the structure according to formula 1 comprising condensing in an alkanesulfonic acid or an arenesulfonic acid to acid according to formula 2 with an aminodiphenylamine of formula 3 wherein R, R-Rare as defined in the specification.