Patents Assigned to St. Regis Paper Company (UK) Limited
  • Method of and apparatus for applying a mark to paper and a paper for use in such method
    Patent number: 4760239
    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.
    Type: Grant
    Filed: May 23, 1986
    Date of Patent: July 26, 1988
    Assignee: St. Regis Paper Company (UK) Limited
    Inventor: Terence G. Makin