Granted Patent
Utility
US 4,968,440 · App. 07/342,191
Coupling element for a filter device
Inventor:
Keith F. Woodruff
Patented Case
View Patent ↗
Granted: Nov 6, 1990
Filed: Apr 24, 1989
Inventor
Keith F. Woodruff
Assignee (at issue)
American Cyanamid 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.