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:
Jun. 07, 1977
Filed:
Oct. 17, 1975
Shoji Ueda, Nagasaki, JA;
Shuzi Ono, Nagasaki, JA;
Hiroshi Sakaguchi, Nagasaki, JA;
Hideo Tsunoda, Nagasaki, JA;
Mitsubishi Jukogyo Kabushiki Kaisha, Tokyo, JA;
Abstract
A method for producing a reduced-pressure shaped mould comprises the steps of placing a pattern having gas-permeable orifices on a surface plate and adhering a coating film that is soluble in a solvent to the pattern by suction through the orifices. A flask having evacuating means is then placed on the surface plate on top of the film and the space portion defined by the film and the flask is filled with solid particles containing no caking agent which serves as a mould material. The mould material and flask are covered with an air-tight sheet and the evacuating means of the flask is actuated while that of the surface plate is released so that the sheet and coating film adhere to the upper and low surfaces respectively of the mould material by suction. The pattern and surface plate are then separated from the flask and a solution containing caking agent dissolved in the solvent is applied to the coating film which is adhered to the surface of a cavity formed at the lower surface of the mould material. The caking agent penetrates interstices between the solid particles whereby a layer that has been hardened by the caking agent may be formed in a surface layer portion bounding the cavity.