Granted Patent
Utility
US 4,291,245 · App. 06/072,303
Electrets
Inventors:
Thomas E. Nowlin, Curt R. Raschke
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Sep 4, 1979
Inventors
Thomas E. Nowlin
Curt R. Raschke
Assignee (at issue)
Union Carbide Corporation
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.