Granted Patent
Utility
US 4,414,172 · App. 06/380,565
Process and apparatus for sealing a plurality of filter elements
Inventor:
Hayden Leason
Patented Case
View Patent ↗
Granted: Nov 8, 1983
Filed: May 21, 1982
Inventor
Hayden Leason
Assignee (at issue)
Filtertek 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.