Granted Patent
Utility
US 4,559,405 · App. 06/600,248
Process for preparing substituted phthalic anhydrides
Inventor:
Jeffrey E. Telschow
Patented Case
View Patent ↗
Granted: Dec 17, 1985
Filed: Apr 16, 1984
Inventor
Jeffrey E. Telschow
Assignee (at issue)
Stauffer Chemical 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.