Pneumatically cleared toy slate

Details Pneumatically cleared toy slate Pneumatically cleared toy slate

1974-03-18

1976-03-16

Skogquist, Harland S.

B43L 112

Patent

active

039436438

ABSTRACT:
A toy slate of the type that has a wax coated dark slate board, a flexible milky translucent film over the slate board and a relatively impression proof transparent plastic cover layer is provided with a means for forcing a blast of air between the wax covered slate board and the translucent plastic layer thereabove to separate such layer from the slate board and clear the toy slate.

REFERENCES:
patent: 1264215 (1918-04-01), Skociokh
patent: 1782328 (1930-11-01), Wearham
patent: 2359195 (1944-09-01), Berliner
patent: 2608771 (1952-09-01), Sparks
patent: 3199743 (1965-08-01), Berger
patent: 3747233 (1973-07-01), Berryman
patent: 3863386 (1975-02-01), Kinberg

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