Granted Patent
Utility
US 5,544,707 · App. 08/204,397
Wellhead
Inventors:
Hans Paul Hopper, Thomas G. Cassity
Patented Case
View Patent ↗
Granted: Aug 13, 1996
Filed: Mar 16, 1994
Inventors
Hans Paul Hopper
Thomas G. Cassity
Assignee (at issue)
Cooper Cameron Corporation
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.