THERMOGRAPHIC COPYING SHEETS
United States Patent 3481760

Inventors:
Clark, Bryce L.
Miller, Carl S.
Publication Date:
12/02/1969
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Assignee:
MINNESOTA MINING & MFG
Primary Class:
430/201
Other Classes:
430/964, 430/348, 503/217, 101/457, 427/559
International Classes:
B41C1/06; B41C1/00; D21H1/28; B41C1/06
US Patent References:
3262386Duplicating method
3322557Thermo-copy system
3332347Duplicating




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