Granted Patent
Utility
US 4,948,504 · App. 07/327,278
Filter bag carrier with filter seal profile
Inventors:
Frank M. Kierdorf, Rainer G. Behnke
Patented Case
View Patent ↗
Granted: Aug 14, 1990
Filed: Mar 22, 1989
Inventors
Frank M. Kierdorf
Rainer G. Behnke
Assignee (at issue)
GAF Chemicals Corporation
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.