Granted Patent
Utility
US 4,244,705 · App. 06/042,041
Triple rotary gas lock seal system for transferring coal continuously into, or ash out of, a pressurized process vessel
Inventors:
Robert M. Seidl, Francis J. Enright
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: May 24, 1979
Inventors
Robert M. Seidl
Francis J. Enright
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.