Granted Patent
Utility
US 4,545,793 · App. 06/564,570
Air filter system with supporting and sealing grid
Inventor:
Bernard R. Shuler
Patented Case
View Patent ↗
Granted: Oct 8, 1985
Filed: Dec 22, 1983
Inventor
Bernard R. Shuler
Assignee (at issue)
Allis-Chalmers Corporation
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.