Granted Patent
Utility
US 4,560,772 · App. 06/663,299
Preparation of substituted phthalic anhydrides
Inventors:
Jeffrey E. Telschow, Edward D. Weil
Patented Case
View Patent ↗
Granted: Dec 24, 1985
Filed: Oct 22, 1984
Inventors
Jeffrey E. Telschow
Edward D. Weil
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.