Granted Patent
Utility
US 5,603,511 · App. 08/514,161
Expandable seal assembly with anti-extrusion backup
Inventors:
William Keyser, Merle L. Bell, Ronney P. Edwards, Weston William Woods
Patented Case
View Patent ↗
Granted: Feb 18, 1997
Filed: Aug 11, 1995
Inventors
William Keyser
Merle L. Bell
Ronney P. Edwards
Weston William Woods
Assignee (at issue)
Greene, Tweed of Delaware, 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.