Method of using a particular tristimulus colorimeter in making a

Details Method of using a particular tristimulus colorimeter in making a Method of using a particular tristimulus colorimeter in making a

1976-04-21

1978-06-20

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Dental shaping type

Tooth forming

264 401, 264 60, 264245, 264250, 264259, 356176, B29C 1100, B29F 500

Patent

active

040962172

ABSTRACT:
Method of using a tristimulus colorimeter including a modified dual slope integrator digital voltmeter which measures the red, blue and green light reflected from a sample and displays the same in digital form as optical density units. The colorimeter includes a light conducting probe with a diffusing member and a movable collar for blocking ambient light, and a rotating color filter wheel is synchronized with the voltmeter for effecting a continuous update of the data displayed thereby. Moreover, a color averaging method provides for prediction of the ultimate color of a mixture of two differently colored porcelains or the like especially used in the construction of artificial teeth or the like.

REFERENCES:
patent: 1547643 (1925-07-01), Clapp
patent: 2314957 (1943-03-01), Thornton et al.
patent: 2869415 (1959-01-01), Kaye
patent: 3159742 (1964-12-01), Davidson
patent: 3600092 (1971-08-01), Murata
patent: 3707726 (1972-12-01), Stearns
patent: 3802783 (1974-04-01), Simmonds
patent: 3885878 (1975-05-01), Ishak
Tylman, "Theory & Practice of Crown and Bridge Prosthesis" Mosby, St. Louis, (1947) pp. 270-277, 279-281 and 532 & 533 relied on.
Ishak, Fibre Optics Colorimeter, Optica ACTA, vol. 17 (1970), pp. 725-732.

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