Granted Patent
Utility
US 4,900,235 · App. 07/308,059
Reversible pump assembly
Inventors:
Jimmie G. Perkins, James W. Grim
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Feb 9, 1989
Inventors
Jimmie G. Perkins
James W. Grim
Assignee (at issue)
McCord Winn Textron
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.