Granted Patent
Utility
US 4,980,415 · App. 07/345,868
Compositions comprising polyphenylene ethers and reactive graft polymers
Inventor:
John R. Campbell
Patented Case
View Patent ↗
Granted: Dec 25, 1990
Filed: May 1, 1989
Inventor
John R. Campbell
Assignee (at issue)
General Electric 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.