Granted Patent
Utility
US 5,338,001 · App. 07/977,384
Valve apparatus
Inventors:
Craig W. Godfrey, Timothy J. Noack, Kenneth L. Schwendemann
Patented Case
View Patent ↗
Granted: Aug 16, 1994
Filed: Nov 17, 1992
Inventors
Craig W. Godfrey
Timothy J. Noack
Kenneth L. Schwendemann
Assignee (at issue)
Halliburton
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.