Granted Patent
Utility
US 4,905,906 · App. 07/317,574
Continuous sprayer
Inventor:
Edwin W. Trefzger
Patented Case
View Patent ↗
Granted: Mar 6, 1990
Filed: Mar 1, 1989
Inventor
Edwin W. Trefzger
Assignee (at issue)
D. B. Smith & Co. 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.