Granted Patent
Utility
US 4,345,509 · App. 06/245,233
Contaminant trap for fluid operated rotary actuator
Inventors:
John W. Bridwell, James Doyle
Patented Case
View Patent ↗
Granted: Aug 24, 1982
Filed: Jun 23, 1980
Inventors
John W. Bridwell
James Doyle
Assignee (at issue)
Caterpillar Tractor Co.
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.