Granted Patent
Utility
US 5,720,891 · App. 08/631,140
Retractable sediment collecting device for covered basins
Inventors:
Lynn W. Cook, Michael J. Graham, Brad Hansen, Marty L. Stout, Jeremy G. Scott
Patented Case
View Patent ↗
Granted: Feb 24, 1998
Filed: Apr 15, 1996
Inventors
Lynn W. Cook
Michael J. Graham
Brad Hansen
Marty L. Stout
Jeremy G. Scott
Assignee (at issue)
Baker Hughes Holdings LLC
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.