Granted Patent
Utility
US 5,585,556 · App. 08/567,426
Method and apparatus for performing measurements while drilling for oil and gas
Inventors:
Steen Petersen, Rune Heggernes
Patented Case
View Patent ↗
Granted: Dec 17, 1996
Filed: Dec 5, 1995
Inventors
Steen Petersen
Rune Heggernes
Assignee (at issue)
NORSK HYDRO ASA
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.