Granted Patent
Utility
US 4,997,952 · App. 07/420,767
N-pyrrolidonyl methyltriphenyl phosphonium salts and method for their preparation and use
Inventors:
Kolazi S. Narayanan, Paul D. Taylor
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: Oct 12, 1989
Inventors
Kolazi S. Narayanan
Paul D. Taylor
Assignee (at issue)
GAF Chemicals Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.