Granted Patent
Utility
US 4,377,529 · App. 06/209,674
Sulfonated group VA ylides and process for preparing same
Inventor:
David L. Beach
Patented Case
View Patent ↗
Granted: Mar 22, 1983
Filed: Nov 24, 1980
Inventor
David L. Beach
Assignee (at issue)
Gulf Research & Development Company
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.