Granted Patent
Utility
US 4,775,299 · App. 06/902,244
Variable clearance pocket piston positioning device
Inventors:
Norbert W. Overfield, Richard W. Erickson
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Aug 29, 1986
Inventors
Norbert W. Overfield
Richard W. Erickson
Assignee (at issue)
Cooper Industries Holdings
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.