Granted Patent
Utility
US 4,062,781 · App. 05/692,993
Disposable filter with interchangeable end elements
Inventors:
Richard Strauss, Philip C. Kimball
Patented Case
View Patent ↗
Granted: Dec 13, 1977
Filed: Jun 4, 1976
Inventors
Richard Strauss
Philip C. Kimball
Assignee (at issue)
Whatman Reeve Angel Limited
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.