Granted Patent
Utility
US 4,813,692 · App. 07/005,954
Pressure balanced S-seal
Inventors:
Horace P. Halling, Robert Alan Barrett, Mark Woozley
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Jan 21, 1987
Inventors
Horace P. Halling
Robert Alan Barrett
Mark Woozley
Assignee (at issue)
EG&G Pressure Science, 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.