Granted Patent
Utility
US 5,816,562 · App. 08/730,498
Sand jack apparatus
Inventors:
Dennis Stockton, Howard C. Gueldner
Patented Case
View Patent ↗
Granted: Oct 6, 1998
Filed: Oct 11, 1996
Inventors
Dennis Stockton
Howard C. Gueldner
Assignee (at issue)
Symons Corporation
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.