Granted Patent
Utility
US 4,155,487 · App. 05/831,713
Trigger sprayer
Inventor:
William S. Blake
Patented Case
View Patent ↗
Granted: May 22, 1979
Filed: Sep 9, 1977
Inventor
William S. Blake
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.