Granted Patent
Utility
US 4,169,754 · App. 05/803,026
Filter tube and method of preparing same
Inventor:
Kenneth A. Perrotta
Patented Case
View Patent ↗
Granted: Oct 2, 1979
Filed: Jun 3, 1977
Inventor
Kenneth A. Perrotta
Assignee (at issue)
Whatman Reeve Angel 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.