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. 19, 1985
Filed:
Jul. 19, 1982
Applicant:
Inventor:
Hans Tanner, Schaffhausen, CH;
Assignee:
George Fischer Ltd., Schaffhausen, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B22C / ;
U.S. Cl.
CPC ...
164 37 ; 164 15 ; 164 20 ;
Abstract
In a closed system a shock pressure wave of a burning gas is used for packing granular mold material loosely distributed around a model. Before the shock pressure is produced, the pore volume of the upper layer of the granular material exposed to the pressure is reduced. Through the pore volume reduction, the active surface of the granular material is increased, so that the gas pressure acts on an increased working surface and, consequently, greater mold hardness is achieved.