Granted Patent
Utility
US 6,554,287 · App. 09/457,997
Collapsing type seal for expandable tubular connections
Inventors:
Robert S. Sivley, IV, John Greenip
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: Dec 9, 1999
Inventors
Robert S. Sivley, IV
John Greenip
Assignee (at issue)
Hydril Company
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.