Robert Christopher Houston

US Patent:

63047446, Oct 16, 2001

Filed:

Nov 5, 1999

Appl. No.:

9/435092

Inventors:

Robert D. Houston - Albuquerque NM
Joseph D'Uva - New Port Richey FL

International Classification:

C09D 1112
G03G 2100

US Classification:

399411

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.