Granted Patent
Utility
US 4,570,531 · App. 06/578,711
Extensible piston with breakable or displaceable coupler
Inventors:
Bruce W. Anderson, Warren D. Chambers
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Feb 9, 1984
Inventors
Bruce W. Anderson
Warren D. Chambers
Assignee (at issue)
ALLIED CONSULTING, INC.
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.