Granted Patent
Utility
US 4,903,937 · App. 07/326,398
Isolation valve for vacuum and non-vacuum application
Inventors:
Antoni F. Jakubiec, Thomas M. Daley
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Mar 21, 1989
Inventors
Antoni F. Jakubiec
Thomas M. Daley
Assignee (at issue)
Varian, 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.