Granted Patent
Utility
US 5,673,810 · App. 08/283,573
Pit lid counterweight assembly
Inventor:
Guy R. Rothrock
Patented Case
View Patent ↗
Granted: Oct 7, 1997
Filed: Aug 1, 1994
Inventor
Guy R. Rothrock
Assignee (at issue)
NOVA LTD.
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.