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:
Jul. 02, 1991
Filed:
Oct. 17, 1990
Applicant:
Inventor:
Georg Frommeyer, Erkrath, DE;
Assignee:
Robert Zapp Werkstofftechnik GmbH & Co. KG, Dusseldorf, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22F / ;
U.S. Cl.
CPC ...
419 12 ; 419 14 ; 419 23 ; 419 28 ; 419 29 ; 419 30 ; 419 31 ; 419 32 ; 419 38 ; 419 43 ; 419 49 ;
Abstract
In a process for making tools from medium and high alloy steels or stellites by superplastic precision forming a powder metallurgically produced starting material with an equiaxed structure and more than 30% by volume of carbidic and/or boridic precipitated phase of particle size 1 to 0.2 .mu.m is given a matrix grain size of 1 to 3 .mu.m by thermomechanical processing (hot forming) and formed in the superplastic state.