Granted Patent
Utility
US 4,340,912 · App. 06/187,292
Random screen generator apparatus for producing halftone images
Inventor:
Donald E. Troxel
Patented Case
View Patent ↗
Granted: Jul 20, 1982
Filed: Sep 15, 1980
Inventor
Donald E. Troxel
Assignee (at issue)
AM International, 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.