Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent
1997-08-26
1998-08-11
Smith, Jeffrey A.
Education and demonstration
Means for demonstrating apparatus, product, or surface...
Chalkboard or equivalent means having easily erasable surface
434416, B43L 112
Patent
active
057919100
ABSTRACT:
A pressure sensitive reusable writing board is provided which includes a backing layer printed with a background color and coated with wax and a single polyester sheet attached to a wax-free strip of the backing and which overlies the wax layer. Pressure applied to a front surface of the polyester sheet causes the sheet to cling to the wax layer thereby showing the writing as a dark color (i.e., the color of the wax) on a white or light background. The white or light background is provided by printing on the undersurface of the polyester sheet with a white opaque finish. Graphics, such as lines, maps or other educational or functional graphics may be disposed on the undersurface of the sheet. The backing may also be mounted onto a larger panel which may include additional informational or decorative graphic presentations.
REFERENCES:
patent: 233597 (1880-11-01), Strauss
patent: 1455579 (1923-05-01), Evans
patent: 4051609 (1977-10-01), Boursaw
patent: 5098502 (1992-03-01), Smolinski
Boursaw Tom
Bradley Jeffrey E.
Masson Daniel P.
Vukmir Mike
Colonial Converting Corporation
Smith Jeffrey A.
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