Granted Patent
Utility
US 4,249,576 · App. 06/061,566
Retrievable plug for offshore platforms having shear type retaining means
Inventors:
Steven G. Streich, L. Carter Knox, Bob L. Sullaway
Patented Case
View Patent ↗
Granted: Feb 10, 1981
Filed: Jul 30, 1979
Inventors
Steven G. Streich
L. Carter Knox
Bob L. Sullaway
Assignee (at issue)
Halliburton
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.