Granted Patent
Utility
US 4,822,569 · App. 06/872,336
Rotary shear valve with cleaning feature and method of using same
Inventor:
Ernest N. Pellegrino
Patented Case
View Patent ↗
Granted: Apr 18, 1989
Filed: Jun 9, 1986
Inventor
Ernest N. Pellegrino
Assignee (at issue)
Fisher Scientific Company, L.L.C.
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.