Granted Patent
Utility
US 4,860,420 · App. 07/035,373
Method of fabricating a clean room filter bank
Inventors:
George H. Cadwell, Jr., Joseph A. Wood
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Apr 7, 1987
Inventors
George H. Cadwell, Jr.
Joseph A. Wood
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.