Granted Patent
Utility
US 4,866,938 · App. 07/147,055
Master cylinder piston with floating sealing ring recuperation valve
Inventors:
Colm Keegan, Michael J. Hawker, Peter Goodwin
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Jan 22, 1988
Inventors
Colm Keegan
Michael J. Hawker
Peter Goodwin
Assignee (at issue)
Clayton Dewandre Co., 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.