Granted Patent
Utility
US 4,607,093 · App. 06/720,778
Sydnone based polyimide
Inventor:
Kwok K. Sun
Patented Case
View Patent ↗
Granted: Aug 19, 1986
Filed: Apr 8, 1985
Inventor
Kwok K. Sun
Assignee (at issue)
THE DOW 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.