Granted Patent
Utility
US 5,961,847 · App. 08/970,407
Filter apparatus with dual drive loops
Inventors:
John L. Creps, Stephen N. McEwen, Richard A. Hallett, Clayton E. Tenniswood
Patented Case
View Patent ↗
Granted: Oct 5, 1999
Filed: Nov 14, 1997
Inventors
John L. Creps
Stephen N. McEwen
Richard A. Hallett
Clayton E. Tenniswood
Assignee (at issue)
Henry Filters, Inc.
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.