Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent
1980-11-24
1982-10-19
Pinkham, Richard C.
Education and demonstration
Means for demonstrating apparatus, product, or surface...
Chalkboard or equivalent means having easily erasable surface
434329, 434346, 434363, 273DIG14, 273240, 273269, A63F 306, A63F 918, G09F 1900
Patent
active
043548458
ABSTRACT:
An identification structure and method for temporary or short term identification of a portion of a surface or substrate. The structure and method include the use of viscous material which is displaced by pressure applied thereto and which retains its displaced condition until smoothed out by any suitable means. Preferably, the viscous material is enclosed in a substantially flat bag which has opposed transparent portions. The viscous material is visible but also has a high degree of transparency. Identification of a portion of a surface or substrate is made as the bag is positioned immediately above or adjacent thereto or in engagement with the surface or substrate. All portions of the surface or substrate are normally visible through the bag and through the viscous material. Pressure is applied to the bag immediately above the portion of the surface to be identified. Such pressure displaces the portion of the viscous material which is immediately above the portion of the surface or substrate to be identified, and that portion of the surface or substrate is thus directly visible through the bag. Thus, the identified portion of the surface or substrate is a portion which is more clearly visible through the bag than portions of the surface or substrate which have the viscous material immediately thereabove.
REFERENCES:
patent: 1568548 (1926-01-01), Edelson
patent: 3497970 (1970-03-01), Padowicz
patent: 3512273 (1970-05-01), Baker, Jr. et al.
patent: 4133536 (1979-01-01), Cole
patent: 4212468 (1980-07-01), Knott
Poteet Anne P.
Poteet Ronald J.
Brown Scott L.
Pinkham Richard C.
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