Granted Patent
Utility
US 4,261,714 · App. 05/900,354
Filtering apparatus
Inventor:
Harley G. Peterson
Patented Case
View Patent ↗
Granted: Apr 14, 1981
Filed: Apr 26, 1978
Inventor
Harley G. Peterson
Assignee (at issue)
Joy Manufacturing 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.