Means for producing high precision castings

Details Means for producing high precision castings Means for producing high precision castings

1990-11-30

1993-02-02

Hoag, Willard

Metal founding

Process

Shaping a forming surface

164DIG4, 249 54, 249 61, 249 72, 249134, B29C 3352, B29C 3926

Patent

active

051830957

ABSTRACT:
The production of high precision molds and castings for dental prosthesis and the like is enhanced with a casting ring and sprue former base constructed of a clear expandable thermoplastic. The ring and base are telescopically interlockable with each other to define a vessel containing a mold form strategically disposed therein so that as investment solution poured throughout is able to cure without detracting from the precise measurements of the mold form to provide a true mold from which precisely dimensioned castings are formed.

REFERENCES:
patent: 1639416 (1927-08-01), Spiro
patent: 2765831 (1956-10-01), Tupper
patent: 3182358 (1965-05-01), Van Rossem
patent: 3531013 (1970-09-01), Hammes
patent: 3610317 (1971-10-01), Benfield
patent: 3939898 (1976-02-01), Petro et al.
patent: 4081019 (1978-03-01), Kulig
patent: 4161208 (1979-07-01), Cooper
patent: 4210258 (1980-07-01), Von Holdt
patent: 4558841 (1985-12-01), Engelmann et al.
patent: 4573921 (1986-03-01), Berger
patent: 4777996 (1988-10-01), Finelt
patent: 4962909 (1990-10-01), Kohler

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