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:
Nov. 11, 1997
Filed:
Jun. 28, 1995
Fuminobu Kubo, Katano, JP;
Kazuhiko Joshin, Yokosuka, JP;
GC Corporation, Tokyo, JP;
Abstract
A method of making a wax pattern by using a dental gypsum model is provided, which comprises the steps of applying a release agent on said gypsum model, coating on the thus applied surface a coating material which leaves no ash upon incinerated at 700.degree. C., and applying a wax melt on said surface. When the wax melt is applied on the gypsum model, the wax is in no direct contact with the release agent, and it is unlikely that gaps may be formed between the wax pattern and the gypsum model or a pad of the wax pattern may warp; that is, the additional operation so far needed for correcting such warpage can be dispensed with, so making precise casting possible. In addition, the presence of the release agent enables removal of the wax pattern to be done as conventional. Furthermore, when the thus removed wax pattern is invested in a investment material to incinerate the wax pattern, no ash of the above coating material remains in the cavity, so that metal can be cast with no defect.