Stencil making device having means for controlling dot perforation density
Patent 5251567 Issued on October 12, 1993. Estimated Expiration Date: 
May 27, 2012. 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.
May 27, 2012. 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 2499472 3541956 3799053 Stencil paper for mimeography and process for making stencil Printing-plate preparation apparatus employed in screen printing machine including a non-adhesive platen surface and a manuscript reading unit. Patent #: 4957378 InventorAssigneeApplicationNo. 888864 filed on 05/27/1992US Classes:101/128.4, Manufacture101/129ProcessesExaminersPrimary: Burr, Edgar S.Assistant: Yan, Ren Attorney, Agent or FirmForeign Patent References
International ClassB41C 001/14Foreign Application Priority Data1991-06-06 JPAbstractA stencil making device capable of controlling numbers of perforations formed by a thermal head. A perforated image is formed by the thermal head in a heat sensitive stencil sheet. An ink in an ink pad passes through the perforated image for providing an inked image on a print sheet. If perforations are densely formed, excessive ink may pass through the perforations. Therefore, the numbers of the perforations are controlled or reduced at a thick character portion. A control unit is provided for changing ON dot area to the OFF dot area of the thermal head if the ON dot area are densely provided. | |
