Granted Patent
Utility
US 6,745,996 · App. 09/626,434
Alternating pressure valve system
Inventor:
Brian Guthrie
Patented Case
View Patent ↗
Granted: Jun 8, 2004
Filed: Jul 27, 2000
Inventor
Brian Guthrie
Assignee (at issue)
Gaymar Industries, 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.