Granted Patent
Utility
US 5,450,872 · App. 08/298,879
Constant pressure valve and method
Inventor:
Amos Pacht
Patented Case
View Patent ↗
Granted: Sep 19, 1995
Filed: Sep 1, 1994
Inventor
Amos Pacht
Assignee (at issue)
Butterworth Jetting Systems, 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.