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US3486923A
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Water treated shadowmarks
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US3443979A
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Method of rendering shadowmark opaque by solvent treatment
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GB1138058A
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Tinted watermark product
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GB1139487A
|
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Chemical watermark applied on finished paper
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GB1149403A
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Chemical shadow mark
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US3441427A
|
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Method of producing opaque shadow mark
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US3464841A
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Method of preparing security paper containing an ultraviolet inhibitor
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ES306793A3
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The method of communicating a substantially permanent filigrana to the paper. (Machine-translation by Google Translate, not legally binding)
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ES306794A3
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A method of communicating a chemical filigrana of selected drawing to a paper sheet. (Machine-translation by Google Translate, not legally binding)
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US3293062A
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Chemical watermark applied on finished paper
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GB1013903A
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The treatment of paper and paper products
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GB1012120A
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Improvements in or relating to the treatment of paper and paper products
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US3140959A
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Paper product with chemical watermark and means for making same
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US3085898A
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Paper product with watermark and process therefor
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CA660672A
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Paper product with watermark and process therefor
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CA811683A
|
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Chemical shadow mark
|
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CA695301A
|
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Paper product with chemical watermark and means for making same
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