Granted Patent
Utility
US 6,044,849 · App. 09/233,908
Fluid pressure relief valve with variable opening pressure
Inventors:
Göran Cewers, Håkan Johansson
Patented Case
View Patent ↗
Granted: Apr 4, 2000
Filed: Jan 21, 1999
Inventors
Göran Cewers
Håkan Johansson
Assignee (at issue)
Siemens Elema AB
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.