Granted Patent
Utility
US 4,928,999 · App. 06/605,378
Elastomeric guard seal for tubular connections
Inventors:
L. Steven Landriault, Donald J. Ortloff, Charles A. Bollfrass
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Apr 30, 1984
Inventors
L. Steven Landriault
Donald J. Ortloff
Charles A. Bollfrass
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.