Granted Patent
Utility
US 5,295,809 · App. 07/978,961
Valved piston pump with cylinder biasing means
Inventors:
Helmut Dresler, Ernst Turnwald
Patented Case
View Patent ↗
Granted: Mar 22, 1994
Filed: Nov 23, 1992
Inventors
Helmut Dresler
Ernst Turnwald
Assignee (at issue)
Linde GmbH
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.