Granted Patent
Utility
US 4,248,058 · App. 06/027,007
Differential piston type reversing valve construction, system utilizing the same and method of making
Inventors:
Werner Bauer, James T. Candor
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Apr 4, 1979
Inventors
Werner Bauer
James T. Candor
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.