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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.:

US 4753678 B1

PDFFull Text
Date of Patent:
Jun. 28, 1988

Filed:

Feb. 25, 1986

Sintered hard metal having superior toughness

Applicant:
Inventors:

Masao Maruyama, Hyogo, JP;

Atsushi Seki, Hyogo, JP;

Masayoshi Yatabe, Hyogo, JP;

Kotaro Hagiwara, Hyogo, JP;

Assignee:

Sumitomo Electric Industries, Ltd., Osaka, JP;

Attorney:

Gerber; Eliot S.

Primary Examiner:

John F Terapane

Assistant Examiner:

Eric Jorgensen

Int. Cl.
CPC ...
C22C / ; C22C / ;
U.S. Cl.
CPC ...
75238 ; 75240 ; 75241 ; 419 15 ; 419 16 ; 419 33 ; 419 49 ;
Abstract

A sintered hard metal having superior toughness and superior hardness may be used for micro-drills, tools and wear resistant parts. The metal is a cemented carbide WC formed from tungsten carbide WC as the base alloy and containing 4 to 20 percent by weight of vanadium carbide VC or zirconium nitride. Its micro-structure is that the WC or WC-VC particles are 0.6.mu. or less, its Rockwell Hardness HRA is at least 91.5 and its transverse rupture strength is at least 350 kg/mm.sup.2.

Find Patent Forward Citations

Maruyama, Masao. (1988). Sintered hard metal having superior toughness (U.S. Patent No. 4753678). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4753678

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