Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent
1992-08-27
1994-06-28
Mancene, Gene
Education and demonstration
Means for demonstrating apparatus, product, or surface...
Chalkboard or equivalent means having easily erasable surface
4284881, 434415, B43L 112
Patent
active
053242025
ABSTRACT:
An apparatus and method for providing a luminescent display by applying pressure to a transparent planar sheet containing a luminescent dye or pigment where such pressure is sufficient to cause one smooth surface of the transparent sheet to contact a facing smooth surface of an opaque planar sheet, the smooth surfaces of the transparent and opaque sheets tending to adhere together at the area of contact, thereby creating a luminescent image at the area of contact which can be selectively erased by separating the smooth surfaces of the transparent and opaque sheets at the area of contact, and for allowing copying of the image by positioning a sheet of carbon paper between the opaque sheet and a sheet of plain paper so that the application of pressure to the transparent sheet causes pressure to be applied through the carbon paper to the sheet of plain paper, thereby copying the image displayed on the transparent sheet onto the sheet of plain paper, the carbon paper being selectively movable to allow segments of carbon paper which can produce images of different colors to be positioned between the opaque sheet and the sheet of plain paper during the drawing of an image to facilitate the production of a multi-colored copy of the displayed image, the apparatus allowing the use of different sizes and multiple sheets of plain paper and providing means for ejecting such paper from the apparatus.
REFERENCES:
patent: 1556499 (1925-10-01), Deutsch
patent: 2596890 (1952-05-01), Dechert
patent: 3761343 (1973-09-01), Kinberg et al.
patent: 4011665 (1977-03-01), Port
patent: 4761139 (1988-08-01), Mashiach
patent: 4927748 (1990-05-01), Kinberg
patent: 5083925 (1992-01-01), Maruyama
Kondo Masayuki
Meyers Norman O.
Mancene Gene
Smith Jeffrey A.
The Ohio Art Company
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