Granted Patent
Utility
US 4,869,319 · App. 07/136,986
Wellhead structure
Inventors:
Edward J. Szymozak, Thomas G. Cassity, William M. Taylor, Peer H. Tiemer, Larry M. Hoes, Jerry D. Smith, Timothy C. Davies
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: Dec 23, 1987
Inventors
Edward J. Szymozak
Thomas G. Cassity
William M. Taylor
Peer H. Tiemer
Larry M. Hoes
Jerry D. Smith
Timothy C. Davies
Assignee (at issue)
Cameron Iron Works USA, 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.