Writing apparatus including electret film

Details Writing apparatus including electret film Writing apparatus including electret film

1990-07-19

1993-05-04

Wilson, John J.

Education and demonstration

Means for demonstrating apparatus, product, or surface...

Chalkboard or equivalent means having easily erasable surface

434413, 434426, 40514, 40594, B43L 100, G09F 1118

Patent

active

052075818

ABSTRACT:
Writing apparatus includes flexible electret film, capable of being erasably written upon with dry erase markers, as a writing medium. The apparatus includes a roll of electret film in a receptacle, brackets for mounting the receptacle to a wall or a conventional flip chart stand, and a cutter to separate the material into sheets.

REFERENCES:
patent: 601416 (1898-03-01), Harrison
patent: 1001402 (1911-08-01), Hindle
patent: 1966276 (1934-07-01), Armstrong
patent: 4670794 (1987-06-01), Araki et al.
patent: 4741119 (1988-05-01), Baryia
patent: 5010671 (1991-04-01), Stonehouse

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