Granted Patent
Utility
US 4,293,111 · App. 05/563,537
Bag filter support cage
Inventor:
Paul Henri
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Mar 31, 1975
Inventor
Paul Henri
Assignee (at issue)
Kennecott Holdings 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.