Granted Patent
Utility
US 5,556,541 · App. 08/233,068
Process for making hermetically sealed filter units and filters made thereby
Inventor:
Rick R. Ruschke
Patented Case
View Patent ↗
Granted: Sep 17, 1996
Filed: Apr 26, 1994
Inventor
Rick R. Ruschke
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.