Granted Patent
Utility
US 4,574,692 · App. 06/658,367
Process and apparatus for the preparation of photographic copies
Inventor:
Robert Wahli
Patented Case
View Patent ↗
Granted: Mar 11, 1986
Filed: Oct 5, 1984
Inventor
Robert Wahli
Assignee (at issue)
Gretag Aktiengesellschaft
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.