Granted Patent
Utility
US 4,810,459 · App. 07/211,109
Method and apparatus for determining true formation porosity from measurement-while-drilling neutron porosity measurement devices
Inventor:
John E. Fontenot
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Jun 21, 1988
Inventor
John E. Fontenot
Assignee (at issue)
NL Industries, 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.