The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 1978
Filed:
Dec. 11, 1975
Frank M Kulig, Bloomfield, CT (US);
The J. M. Ney Company, Bloomfield, CT (US);
Abstract
A synthetic sprue forming assembly comprises a base or preform adapted for engagement with a crucible former, a plurality of sprue formers, and one or more conduit forming shafts extending between the base and sprue formers. Each sprue former consists of a first portion connected to a shaft, a gate portion, and an enlarged reservoir portion therebetween. In one embodiment, there are a pluality of integral sprue pins seated in recesses in the base and each comprising a shaft portion and a sprue former portion extending at an angle to the longitudinal axis of the shaft. In another embodiment, there is one large shaft integral with the base, and the reservoir and gate portions are integrally formed and rotatably and detachably mounted to a conduit portion on the large shaft. In the method of making an investment mold, the base and sprue formers are assembled on a crucible former in an investment mold container. After a pattern is mounted on the gate portions of the assembly, the mold container is filled with investment material which is allowed to set, and the assembly is fired to burn out the sprue forming elements and pattern and form the investment mold.