Granted Patent
Utility
US 5,006,845 · App. 07/366,093
Gas kick detector
Inventors:
Henry V. Calcar, Gary L. Marsh
Patented Case
View Patent ↗
Granted: Apr 9, 1991
Filed: Jun 13, 1989
Inventors
Henry V. Calcar
Gary L. Marsh
Assignees (at issue)
Honeywell Limited
Shell Offshore 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.