Granted Patent
Utility
US 5,730,767 · App. 08/688,513
Sealing apparatus in a belt-type filter
Inventor:
David Helmlinger
Patented Case
View Patent ↗
Granted: Mar 24, 1998
Filed: Jul 30, 1996
Inventor
David Helmlinger
Assignee (at issue)
Pneumafil 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.