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:
Jan. 27, 1998
Filed:
Jan. 14, 1997
Applicant:
Inventors:
Charles B Kreutzberger, Pittsburgh, PA (US);
Seetha Eswarakrishnan, Allison Park, PA (US);
Suresh B Damle, Pittsburgh, PA (US);
Assignee:
PPG Industries, Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
558283 ; 558282 ; 502167 ; 502162 ; 549499 ;
Abstract
Novel catalysts for the synthesis of a alpha-chlorinated chloroformate from an aldehyde and phosgene are described. The catalysts include alkyl substituted guanidines, hexasubstituted guanidinium chlorides, substituted biguanidinium chloride, phenyldialkyliminiumtetraalkylguanidinium chloride, dialkylimidazolinium tetraalkylguanidinium chloride, phenyltetraalkylamidinium chloride and N,N-dialkyl-N'-alkylpyrrolidinium chloride.