Granted Patent
Utility
US 4,381,868 · App. 06/286,379
Pressure-actuated wellhead sealing assembly
Inventors:
David G. Croy, Lee M. Hollingsworth, Leonard E. Williams, Jr., Richard D. Jolly, Mark C. Tate
Patented Case
View Patent ↗
Granted: May 3, 1983
Filed: Jul 24, 1981
Inventors
David G. Croy
Lee M. Hollingsworth
Leonard E. Williams, Jr.
Richard D. Jolly
Mark C. Tate
Assignee (at issue)
Cameron Iron Works, 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.