Granted Patent
Utility
US 4,263,003 · App. 06/037,225
Method of mixing liquids in closed containers
Inventor:
William D. Vork
Patented Case
View Patent ↗
Granted: Apr 21, 1981
Filed: May 8, 1979
Inventor
William D. Vork
Assignee (at issue)
GRACO 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.