IP Library › Granted Patent US 4,697,175
Granted Patent Utility
US 4,697,175 · App. 06/595,124

Lightpen control circuit

Inventor: John B. MacDonald
Patented Case View Patent ↗
Granted: Sep 29, 1987 Filed: Mar 30, 1984
Inventor
John B. MacDonald
Assignee (at issue)
American Telephone and Telegraph Company, AT&T Technologies, 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.

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Quick Facts
Patent No.
US 4,697,175
App. No.
06/595,124
Filed
1984-03-30
Granted
1987-09-29
Kind
A