Granted Patent
Utility
US 5,280,807 · App. 07/968,497
Supply circuit for a two-tube hydraulic system
Inventors:
Heinz Frey, Kamil Prochazka
Patented Case
View Patent ↗
Granted: Jan 25, 1994
Filed: Oct 29, 1992
Inventors
Heinz Frey
Kamil Prochazka
Assignee (at issue)
Asea Brown Boveri, S.A.
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.