Plastic article or earthenware shaping or treating: apparatus – Means forming a mold; or flask – per se
Reexamination Certificate
2007-09-06
2009-08-25
Heitbrink, Tim (Department: 1791)
Plastic article or earthenware shaping or treating: apparatus
Means forming a mold; or flask, per se
C425S812000, C425SDIG011
Reexamination Certificate
active
07578667
ABSTRACT:
The invention relates to a dental mold flask (10) for production, in particular for injection molding, of dental molded parts, with at least two mold shells (12) via which a mold cavity (14) can be formed for introduction of polymerizable plastic through a filling channel (16), and with an air release channel (42) for the air that escapes during filling of the mold cavity (14). The air release channel (42) has a filter element (40) whose permeability for air changes automatically, in particular decreases, as soon as it comes into contact with the polymerizable plastic.
REFERENCES:
patent: 2030524 (1936-02-01), Lambert
patent: 2222531 (1940-11-01), Dwyer
patent: 2233295 (1941-02-01), Miller
patent: 2806253 (1957-09-01), Vernon
patent: 3277576 (1966-10-01), Kraft
patent: 3404056 (1968-10-01), Baldwin
patent: 3815115 (1974-06-01), Inque
patent: 5672305 (1997-09-01), Kogure
patent: 2331294 (1975-01-01), None
patent: 10331863 (2004-10-01), None
patent: 1442041 (1976-07-01), None
Pokorny Walter
Wachter Wolfgang
Heitbrink Tim
Ivoclar Vivadent AG
Korman Alan S.
Thompson John C.
Thompson Sandra J.
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