Granted Patent
Utility
US 4,325,717 · App. 06/248,146
Seal protector for air filtering apparatus
Inventor:
John Crowley
Patented Case
View Patent ↗
Granted: Apr 20, 1982
Filed: Mar 30, 1981
Inventor
John Crowley
Assignee (at issue)
Continental Conveyor & Equipment 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.