Granted Patent
Utility
US 4,489,671 · App. 06/498,079
Coating apparatus
Inventor:
Edward J. Choinski
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: May 25, 1983
Inventor
Edward J. Choinski
Assignee (at issue)
Polaroid Corporation
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.