Granted Patent
Utility
US 4,731,188 · App. 06/847,774
Adjustable ramp for dewatering device
Inventors:
Harold W. Johnson, Thomas R. McClughan, Joseph V. Zapata
Patented Case
View Patent ↗
Granted: Mar 15, 1988
Filed: Apr 3, 1986
Inventors
Harold W. Johnson
Thomas R. McClughan
Joseph V. Zapata
Assignee (at issue)
Ashbrook Simon-Hartley, LP
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.