Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent
1995-06-12
1997-07-22
Smith, Jeffrey A.
Education and demonstration
Means for demonstrating apparatus, product, or surface...
Chalkboard or equivalent means having easily erasable surface
434417, 434408, B43L 100
Patent
active
056498284
ABSTRACT:
A writing board system comprises a white board having a writing surface for receiving a written mark thereupon, a liquid tank filled with water liquid for erasing the written mark from the writing surface, an applicator for applying the liquid in the liquid tank onto the writing surface, and a writing implement having an ink including at least one electron donative coloring compound selected from the group consisting of 2-{2-[4-(dodecyloxy)-3-metoxyphenl]-ethenyl}quinoline, 3-cyclohexylamino-6-chlorofluoran, 3-diethyl amino benzo [a]-fluoran, 3-(4-diethylamino-2-etoxyphenyl)-3-(1-ethyl-2-methylindol-3-yl)-4-azaphtha lide, 3.3 bis(4-diethylamino-2-etoxyphenyle)-4- azaphthalide, and 3-cyclohexyl methyl amino-6-methyl-7-anilinofluoran, and an electron acceptive developing compound selected from the group consisting of zinc salicylate and bisphenol A.
REFERENCES:
patent: 1227205 (1917-05-01), Sartakoff
patent: 3163943 (1965-01-01), Bell
patent: 4907903 (1990-03-01), Kawashima
Patent Abstracts of Japan, vol. 018, No. 619 (C-1278) 25 Nov. 1994.
Patent Abstracts of Japan, vol. 940, No. 012 6 Dec. 1994.
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