Granted Patent
Utility
US 4,772,443 · App. 06/940,173
Thermally formed filter
Inventors:
Donald I. Thornton, Clarke A. Rodman
Patented Case
View Patent ↗
Granted: Sep 20, 1988
Filed: Dec 10, 1986
Inventors
Donald I. Thornton
Clarke A. Rodman
Assignee (at issue)
ALLIED CONSULTING, 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.