Granted Patent
Utility
US 5,358,035 · App. 08/117,536
Control cartridge for controlling a safety valve in an operating well
Inventor:
Richard Grudzinski
Patented Case
View Patent ↗
Granted: Oct 25, 1994
Filed: Sep 7, 1993
Inventor
Richard Grudzinski
Assignee (at issue)
GEO Research
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.