Granted Patent
Utility
US 6,412,349 · App. 09/276,845
Force balancing capacitance manometer
Inventors:
Daniel G. Bills, Wilbert Leonard Porter
Patented Case
View Patent ↗
Granted: Jul 2, 2002
Filed: Mar 26, 1999
Inventors
Daniel G. Bills
Wilbert Leonard Porter
Assignee (at issue)
Helix Technology 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.