Granted Patent
Utility
US 4,385,821 · App. 06/136,805
Automatic velocity and position controller for a film processor
Inventor:
Robert Kachelries
Patented Case
View Patent ↗
Granted: May 31, 1983
Filed: Apr 3, 1980
Inventor
Robert Kachelries
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND 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.