Granted Patent
Utility
US 4,050,512 · App. 05/702,406
Stroke actuated well testing tool
Inventor:
Bernhardt F. Giebeler
Patented Case
View Patent ↗
Granted: Sep 27, 1977
Filed: Jul 6, 1976
Inventor
Bernhardt F. Giebeler
Assignee (at issue)
BJ-Hughes 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.