Granted Patent
Utility
US 4,442,004 · App. 06/394,195
Biasing arrangement and filter unit for a filtering apparatus
Inventors:
Zan P. Smith, Frank Haimbach, IV
Patented Case
View Patent ↗
Granted: Apr 10, 1984
Filed: Jul 1, 1982
Inventors
Zan P. Smith
Frank Haimbach, IV
Assignee (at issue)
Osmonics, 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.