Granted Patent
Utility
US 4,272,259 · App. 05/806,340
Gas gettering system
Inventors:
Michael Patterson, Harry Cheung, David Wang
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: Jun 14, 1977
Inventors
Michael Patterson
Harry Cheung
David Wang
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.