Granted Patent
Utility
US 5,766,289 · App. 08/804,241
Pleated filter element and filtration unit
Inventor:
Clifford D. Haggard
Patented Case
View Patent ↗
Granted: Jun 16, 1998
Filed: Feb 20, 1997
Inventor
Clifford D. Haggard
Assignee (at issue)
Purolator Products 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.