Granted Patent
Utility
US 4,298,019 · App. 06/107,799
Method and system for controlling the fluid level in a drain tank
Inventors:
Thomas E. Daransky, John Dickinson
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Dec 27, 1979
Inventors
Thomas E. Daransky
John Dickinson
Assignee (at issue)
Westinghouse Electric Company LLC
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.