Dry transfer sheets
Patent 4041204 Issued on August 9, 1977. Estimated Expiration Date: 
August 9, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 9, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3353955 3660088 3736138 3764318 3770438 3775113 3928710 InventorsAssigneeApplicationNo. 05/434595 filed on 01/18/1974US Classes:430/253, Separating exposed areas from unexposed or underexposed areas of image layer by transfer, element or image receiving layer therefor156/240, Transfer of printing or design427/152, Coating opposite sides or forming plural or nonuniform coats428/195.1, Discontinuous or differential coating, impregnation or bond (e.g., artwork, printing, retouched photograph, etc.)428/199, Including developable image or soluble portion in coating or impregnation (e.g., safety paper, etc.)428/200, With heat sealable or heat releasable adhesive layer428/202, With outer strippable or release layer428/914, TRANSFER OR DECALCOMANIA430/271.1Identified backing or protective layer containingExaminersPrimary: Lesmes, George F.Assistant: Thibodeau, Paul J. Attorney, Agent or FirmForeign Application Priority Data1973-01-18 UKAbstractA photosensitive sheet product which enables dry transfer sheets to be made very simply by a process involving photographic exposure, water-washing to remove unexposed parts of the photosensitive material and drying. The photo-sensitive material itself contains the resin or other adhesive present in the letters or other transferable images and the problem of the adhesiveness which would be apparent in the transferred characters or pictorial matter in the product is solved by making the dry transfer sheet with a temporary keycoat which transfers with the characters or pictorial matter and remains as a protective layer on the finished product. Another advantageous feature of the dry transfer sheets described is that they can be formulated so as to be pressure-transferable in the normal way or alternatively can be heated or solvent-treated to exhibit a permanently increased adhesiveness, making broad-area transfer possible using much lower transfer pressures than required in normal use. |
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