Granted Patent
Utility
US 4,698,074 · App. 07/012,605
Air cleaning apparatus
Inventors:
Newell E. Cumming, James H. Sidell
Patented Case
View Patent ↗
Granted: Oct 6, 1987
Filed: Feb 9, 1987
Inventors
Newell E. Cumming
James H. Sidell
Assignee (at issue)
Cumming 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.