Method of and apparatus for applying a mark to paper and a paper

Details Method of and apparatus for applying a mark to paper and a paper Method of and apparatus for applying a mark to paper and a paper

1986-05-23

1988-07-26

Albritton, C. L.

Electric heating

Metal heating

By arc

162110, 162117, B23K 2600

Patent

active

047602392

ABSTRACT:
A method of applying a "pseudo watermark" to paper, comprises the steps of preparing a paper containing a suitable amount of a thermally sensitive material, the presence of which renders the translucency of the paper variable by temperature change, and subsequently applying heat to a part of the surface of the paper in a manner to cause a region of the paper to become semi-translucent. Apparatus suitable for applying heat to the paper is also disclosed.

REFERENCES:
patent: 1716699 (1929-06-01), Kirkegaard
patent: 1874427 (1932-08-01), Billings
patent: 4216055 (1980-08-01), Watanabe et al.
patent: 4257842 (1981-03-01), Ciaccia et al.

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