Granted Patent
Utility
US 4,507,247 · App. 06/469,897
Sulfonated Group Va ylides and process for preparing same
Inventors:
David L. Beach, James J. Harrison
Patented Case
View Patent ↗
Granted: Mar 26, 1985
Filed: Feb 25, 1983
Inventors
David L. Beach
James J. Harrison
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.