Granted Patent
Utility
US 4,380,321 · App. 06/228,365
Color change valve structure for rotary head electrostatic spray coating systems
Inventors:
Samuel W. Culbertson, Charles W. McCulloch, Keith G. Williams
Patented Case
View Patent ↗
Granted: Apr 19, 1983
Filed: Jan 26, 1981
Inventors
Samuel W. Culbertson
Charles W. McCulloch
Keith G. Williams
Assignee (at issue)
Binks Manufacturing Company
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.