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. 01, 1976
Filed:
Apr. 25, 1975
Mitsubishi Jukogyo Kabushiki Kaisha, Tokyo, JA;
Abstract
An improved method of producing a mould under a reduced pressure is described herein. In the improved method, after a main pattern (1) having a protrusion and a recess is inserted with an auxiliary pattern (8) having the same shape as said recess and having an air-tight film (9) tightly adhered on its outer peripheral surface into said recess, said main pattern (1) is fixedly placed on a surface plate (2) provided with evacuating means, and the surface of the main pattern (1) including the upper surface of said surface plate but excluding the upper surface of said auxiliary pattern (8) is covered with an air-tight film (3). Then, after said air-tight film (3) has been tightly adhered onto the surface of the main pattern (1) excluding the upper surface of said auxiliary pattern (8) and onto the upper surface of the surface plate (2) with the evacuating means of the surface plate (2), said auxiliay pattern (8) is extracted from the main pattern (1). Subsequently, after a casting frame (4) provided with pressure reducction means has been placed on the surface plate (2), solid particles (7) are filled in said casting frame (4). Still further, after the entire top surface of said casting frame (4) and the solid particles (7) has been covered with an air-tight film (10), said air-tight films (3) and (9) are adhered onto the side of the solid particles (7) by reducing the pressure within said casting frame (4) with said pressure reduction means and by recovering an atmospheric pressure within the surface plate (2), and then the main pattern (1) as well as the surface plate (2) are separated from the casting frame (4).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile