Granted Patent
Utility
US 4,044,794 · App. 05/630,166
Slow-opening gas valve
Inventor:
Russell B. Matthews
Patented Case
View Patent ↗
Granted: Aug 30, 1977
Filed: Nov 10, 1975
Inventor
Russell B. Matthews
Assignee (at issue)
Johnson Controls, Inc.
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.