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:
Apr. 07, 1998
Filed:
Aug. 11, 1995
James A Oti, Franklin, MA (US);
Johnson & Johnson Professional, Inc., Raynham, MA (US);
Abstract
The investment casting process utilizes an investment assembly that includes one or more vents in each casting mold. Vents facilitate the extraction of the pattern material while preventing expansion of the pattern material to the extent that mold fracture or cracking results. The vents can be formed by incorporating within the patterns of articles to be cast one or more protrusions that cause the pattern to deviate from the size and shape of the article to be cast. After assembly of one or more patterns to a riser to form a cluster, the cluster is coated with a refractory material and the refractory material is removed from the protrusions either before the refractory dries or after the refractory dries, thus producing the vents.