# US 12,759,176 B2 · Razor blade and manufacturing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,759,176 B2 - Document ID: US12759176B2 - Status: Granted - Kind: B2 - Application number: 18/783,148 - Filed: 2024-07-24 - Published: 2024-11-14 - Granted: 2026-10-13 - Earliest claimed: 2019-05-22 - Assignees: Dorco Co., Ltd. - Applicants: Dorco Co., Ltd. - Inventors: Min Joo Park; Sung Hoon Oh; Seong Won Jeong - Web page: https://patentgrep.com/patent/US12759176B2 ## CPC - B26B 21/60: by the coating material - B26B 21/4068: {Mounting devices; Manufacture of razors or cartridges (B26B21/528 takes precedence)} - C23C 14/16: on metallic substrates or on substrates of boron or silicon - C23C 14/3407: {Cathode assembly for sputtering apparatus, e.g. Target} - B26B: HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR (for harvesting A01D; for horticulture, for forestry A01G; for butchering or meat treatment A22; for manufactering or repairing footwear A43D; nail clippers or cutters A45D29/02; kitchen equipment A47J; {vegetable slicers, julienne cutters and similar devices and holders therefor, B26D3/28}; for surgical purposes A61B; for metal B23D; cutting by abrasive fluid jets B24C5/02; plier-like tools with cutting edges B25B7/22; pincers B25C11/02; handles for hand implements, in general B25G; guillotine-type cutters B26D; {perforating by non-mechanical means, e.g. by fluid jet, B26F1/26}; for erasing B43L19/00; for textile materials D06H) - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) ## Abstract The present disclosure provides a razor blade coating by a physical vapor deposition method through performing a deposition with a single composite target composed of dissimilar materials with their area ratio defined to be varied in the single composite target in the direction of transferring the razor blade subject to the deposition, thereby forming a single layer in which the composition ratio of the dissimilar materials gradually changes in the thickness direction of the coating layer to improve the durability of the razor blade coating layer. ## Claims ### Claim 1 A razor blade, comprising: a blade substrate comprising a blade edge; a hard coating layer coated on the blade substrate and comprising at least two regions; and a polymer coating formed on the hard coating layer, wherein: the hard coating layer comprises three or more dissimilar materials, including metal and boron; and the at least two regions comprise at least one of a crystal structure of dissimilar materials or an amorphous structure of dissimilar materials. ### Claim 2 (depends on 1) The razor blade of claim 1, wherein the at least two regions are not distinguishable. ### Claim 3 (depends on 1) The razor blade of claim 1, wherein the at least two regions further comprise: an adhesion enhancing region in contact with the blade substrate; and a surface hardness enhancing region disposed on an outer side of the adhesion enhancing region. ### Claim 4 (depends on 3) The razor blade of claim 3, wherein an atomic ratio of metal to boron of the adhesion enhancing region is larger than an atomic ratio of metal to boron of the surface hardness enhancing region. ### Claim 5 (depends on 3) The razor blade of claim 3, wherein an atomic ratio of metal to boron gradually changes from the adhesion enhancing region to the surface hardness enhancing region. ### Claim 6 (depends on 3) The razor blade of claim 3, wherein the at least two regions further comprise a coating layer strength-enhancing region disposed between the adhesion enhancing region and the surface hardness enhancing region. ### Claim 7 (depends on 6) The razor blade of claim 6, wherein the coating layer strength-enhancing region is configured to have a dispersion of the crystal structure of dissimilar materials surrounded by the amorphous structure of dissimilar materials. ### Claim 8 (depends on 6) The razor blade of claim 6, wherein an intra-volume share of the crystal structure of dissimilar materials is larger at the surface hardness enhancing region than the coating layer strength-enhancing region. ### Claim 9 (depends on 6) The razor blade of claim 6, wherein a diameter of the crystal structure of dissimilar materials is larger at the surface hardness enhancing region than the coating layer strength-enhancing region. ### Claim 10 (depends on 1) The razor blade of claim 1, wherein the metal comprises one of Cr, Ni, Ti, W, or Nb. ### Claim 11 (depends on 10) The razor blade of claim 10, wherein the metal is Cr.