Granted Patent
Utility
US 4,376,675 · App. 06/193,924
Method of manufacturing an inorganic fiber filter tube and product
Inventor:
Kenneth A. Perrotta
Patented Case
View Patent ↗
Granted: Mar 15, 1983
Filed: Oct 6, 1980
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.