Granted Patent
Utility
US 5,007,989 · App. 07/422,707
Method and articles employing ion exchange material
Inventors:
Eric Nyberg, Ken A. Klingman, Jeff Curtis, Ray F. Stewart
Patented Case
View Patent ↗
Granted: Apr 16, 1991
Filed: Oct 17, 1989
Inventors
Eric Nyberg
Ken A. Klingman
Jeff Curtis
Ray F. Stewart
Assignee (at issue)
Raychem Limited
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.