Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent
1994-12-16
1996-06-25
Cheng, Joe
Education and demonstration
Means for demonstrating apparatus, product, or surface...
Chalkboard or equivalent means having easily erasable surface
434365, 434410, 401 2, 345179, 374183, B43L 100
Patent
active
055295010
ABSTRACT:
First and second switches, which are to be operated by a user, are provided on a pen-shaped housing. A first heat generating head for writing an image on a rewritable heat sensitive sheet is arranged at an end of a tapered end portion of the pen-shaped housing, and a second heat generating head, for generating heat at a temperature which is different from a temperature of heat generated from the writing head, is arranged at flat another end of the pen-shaped housing. The writing head generates heat only when the first switch is turned on, and the erasing head generates heat only when the second switch is turned on, so that the erasing head erases the image which have been written on the heat sensitive sheet from the sheet.
REFERENCES:
patent: 3886311 (1975-05-01), Rodgers et al.
patent: 4176273 (1979-11-01), Fujie et al.
patent: 4523235 (1985-06-01), Rajchman
patent: 4758846 (1988-07-01), Watkins
patent: 5467102 (1995-11-01), Kuno et al.
patent: 5475401 (1995-12-01), Verrier et al.
Casio Computer Co. Ltd.
Cheng Joe
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