Granted Patent
Utility
US 4,646,775 · App. 06/783,695
Vacuum breaker
Inventor:
Paul L. Traylor
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Oct 3, 1985
Inventor
Paul L. Traylor
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.