Granted Patent
Utility
US 4,846,045 · App. 07/129,236
Expansible chamber motor
Inventors:
Ayzik Grach, Thomas M. Arens
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Dec 7, 1987
Inventors
Ayzik Grach
Thomas M. Arens
Assignee (at issue)
McNeil (Ohio) 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.