Patents Assigned to D'uva Fine Artists Materials, Inc.
  • Patent number: 6081689
    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.
    Type: Grant
    Filed: June 28, 1999
    Date of Patent: June 27, 2000
    Assignee: D'uva Fine Artists Materials, Inc.
    Inventors: Robert D. Houston, Joseph D'uva, Jr.