Electrophotography – Miscellaneous
Patent
1999-06-28
2000-06-27
Moses, Richard
Electrophotography
Miscellaneous
106 3101, C09D 1112, G03G 2100
Patent
active
060816899
ABSTRACT:
A method of producing and using an artists chalk from dry copier toner is disclosed. The method includes the steps of providing a holder having a cavity for holding the toner, the cavity having a shape which, at least approximately, defines the shape of the finished chalk; and heating the toner at a temperature high enough and for a period long enough to sinter the toner into a chalk. Pressure is not applied to the toner particles. The temperature is in the range of, approximately, 150.degree. F. to 220.degree. F., and the time is in the range of, approximately, 3 to 60 minutes. The holder typically includes a paper tube which forms part of the finished chalk. Typically, the temperature is in the range of 180.degree. F. to 185.degree. F., and the time is in the range of 7 to 11 minutes. For harder chalks higher temperatures and shorter times are used. For softer chalks, lower temperature and longer times are used. The chalk produces a permanent image on a medium, such as paper, by fixing the toner chalk on the medium by only the application of heat.
REFERENCES:
patent: 3924566 (1975-12-01), Dennie
patent: 4052298 (1977-10-01), Bradley
patent: 4193906 (1980-03-01), Hatanaka
patent: 5136338 (1992-08-01), Greenaway
Superior Tusche Washes Using Dry Copier Toners, Nick Semenoff, Leonardo, vol. 20, No. 1, pp. 71-77, 1987.
D'uva, Jr. Joseph
Houston Robert D.
D'uva Fine Artists Materials, Inc.
Morgan DeWitt M.
Moses Richard
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