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. 16, 1999
Filed:
Feb. 27, 1997
Applicant:
Inventors:
Wolfgang Weise, Frankfurt, DE;
Willi Malikowski, Aschaffenburg, DE;
Roger Wolmer, Gelnhausen, DE;
Peter Braumann, Alzenau, DE;
Andreas Koffler, Nidderau, DE;
Assignee:
Degussa Aktiengesellschaft, Frankurt, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B22F / ; B22F / ; B22F / ; H01H / ;
U.S. Cl.
CPC ...
428346 ; 428567 ; 428568 ; 428673 ; 428929 ; 200265 ; 200266 ; 75232 ; 75235 ; 75236 ; 75246 ; 419 38 ; 419 41 ; 419 42 ; 419 13 ; 419 14 ; 419 21 ;
Abstract
Sintered silver-iron material for electrical contacts, with properties comparable with those of silver-nickel materials, is obtained by using iron powder having more than 0.25% carbon by weight and microhardness higher than 200 HV 0.025 and sintering in a hydrogen-free protective gas.