Granted Patent
Utility
US 5,340,912 · App. 08/023,428
Cyanate resins
Inventors:
Pen-Chung Wang, Donald R. Kelsey
Patented Case
View Patent ↗
Granted: Aug 23, 1994
Filed: Feb 23, 1993
Inventors
Pen-Chung Wang
Donald R. Kelsey
Assignee (at issue)
SHELL OIL 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.