Granted Patent
Utility
US 4,292,992 · App. 06/059,966
Valve for handling solids capable of gas-pressure-tight closure against a gas pressure differential
Inventor:
Yeshwant K. Bhide'
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Jul 23, 1979
Inventor
Yeshwant K. Bhide'
Assignee (at issue)
Allis-Chalmers Corporation
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.