Granted Patent
Utility
US 4,490,658 · App. 06/427,969
Circuit for automatically sequencing a valve mechanism
Inventor:
Robert S. John
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Sep 29, 1982
Inventor
Robert S. John
Assignee (at issue)
International Telephone and Telegraph 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.