Granted Patent
Utility
US 4,671,811 · App. 06/733,971
Laminar flow clean room
Inventors:
George H. Cadwell, Jr., Clarence B. Pittman
Patented Case
View Patent ↗
Granted: Jun 9, 1987
Filed: May 14, 1985
Inventors
George H. Cadwell, Jr.
Clarence B. Pittman
Assignee (at issue)
FLANDERS FILTERS, INC.
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.