3636251 is referenced by 56 patents and cites 3 patents.

A system for engraving intaglio printing plates in which tiny uniformly sized cells are formed in the printing plate by the engraving tool, preferably a pulsed output laser, and in which variable tone is rendered by varying the spatial density of the cells.

Title
Laser facsimile system for engraving printing plates
Application Number
04/755,951
Publication Number
3636251
Application Date
August 28, 1968
Publication Date
January 18, 1972
Inventor
Kaplan Robert A
Daly Richard T
Assignee
Quantronix Corporation
IPC
H04n 01/26
H04n 01/08
H01s 03/09
H04N 01/32
H04N 01/405
B41C 01/02
B41C 01/05
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