Granted Patent
Utility
US 4,448,925 · App. 06/406,110
Injection moldable polymers containing phthalic anhydride
Inventor:
Robert B. Hanson
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Aug 6, 1982
Inventor
Robert B. Hanson
Assignee (at issue)
Standard Oil Company (Indiana)
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.