Granted Patent
Utility
US 4,388,969 · App. 06/211,614
Borehole pipe side entry method and apparatus
Inventors:
Gailen D. Marshall, C. H. Myska, Kenneth E. Smith
Patented Case
View Patent ↗
Granted: Jun 21, 1983
Filed: Dec 1, 1980
Inventors
Gailen D. Marshall
C. H. Myska
Kenneth E. Smith
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.