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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 12551950 B1

PDFFull Text
Date of Patent:
Feb. 17, 2026

Filed:

Sep. 06, 2021

Hard coating film for cutting tool

Applicant:

Korloy Inc., Seoul, KR;

Inventors:

Jin-Han Gwon, Cheongju-si, KR;

Seung-Su Ahn, Cheongju-si, KR;

Je-Hun Park, Cheongju-si, KR;

Assignee:

KORLOY INC., Seoul, KR;

Attorney:

LEX IP MEISTER, PLLC

Primary Examiner:

Z Jim Yang

Int. Cl.
CPC ...
C23C 14/08 (2006.01); B23B 27/14 (2006.01); C23C 14/06 (2006.01); C23C 14/32 (2006.01); C23C 14/35 (2006.01); C23C 28/04 (2006.01); C23C 30/00 (2006.01);
U.S. Cl.
CPC ...
B23B 27/148 (2013.01); C23C 14/0641 (2013.01); C23C 14/081 (2013.01); C23C 14/32 (2013.01); C23C 14/35 (2013.01); C23C 28/042 (2013.01); C23C 30/005 (2013.01); B23B 2224/24 (2013.01); B23B 2228/105 (2013.01);
Abstract

The present invention relates to a cutting tool composed of a hard base material, such as cemented carbide, cermet, ceramic, and cubic boron nitride, and a hard coating film formed on the hard base material. A hard coating film for a cutting tool according to the present invention is formed in a multi-layered structure on a base material of a cutting tool, wherein the hard coating film includes one or more layers of a coating film made of an oxide and one or more layers of a coating film made of a nitride, and is characterized in that the O/(O+N) ratio in an edge center of the cutting tool is lower than the O/(O+N) ratio in a region 100 μm or further away from the edge center in the entire hard coating film.

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