# US 8,769,833 B2 · Utility knife blade > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,769,833 B2 - Document ID: US8769833B2 - Status: Granted - Kind: B2 - Application number: 12/879,115 - Filed: 2010-09-10 - Published: 2012-03-15 - Granted: 2014-07-08 - Earliest claimed: 2010-09-10 - Assignees: Stanley Black & Decker, Inc. - Applicants: Peter Geoffrey Culf - Inventors: Peter Geoffrey Culf - Web page: https://patentgrep.com/patent/US8769833B2 ## CPC - B62B 9/00: Accessories or details specially adapted for children's carriages or perambulators (providing for travelling on snow B62B19/00) - B23P 15/40: shearing tools - B26B 9/00: Blades for hand knives - B26B 9/02: characterised by the shape of the cutting edge, e.g. wavy - C23C 24/10: with intermediate formation of a liquid phase in the layer - C23C 28/021: {including at least one metal alloy layer} - C23C 28/027: {including at least one metal matrix material comprising a mixture of at least two metals or metal phases or metal matrix composites, e.g. metal matrix with embedded inorganic hard particles, CERMET, MMC.} - C23C 30/005: {on hard metal substrates} - B26B 21/58: characterised by the material - B26D 2001/002: {Materials or surface treatments therefor, e.g. composite materials} - B26D 2001/0053: {having a special cutting edge section or blade section} - B62B: HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES (characterised by animal propulsion B62C; propulsion of sledges by driver or engine B62M) - B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q) - 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) - B26D: CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING (for growing crops or plants A01D, A01G; for fodder or straw A01F; for bulk butter A01J; for dough A21C; slaughtering A22B; for tobacco, cigars or cigarettes A24; marking-out, perforating or making buttonholes A41H25/00; manufacturing footwear A43D; brushmaking A46D; surgery A61B; disintegrating, mincing or shredding in general B02C; cutting wire, making pins or nails B21F, B21G; of the kind used formetal B23; cutting by abrasive fluid jets B24C5/02; hand-held cutting tools B26B; perforating, cutting-out, stamping-out or punching, or severing by means other than cutting B26F; for wood B27; for stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; article or web delivery apparatus incorporating cutting or line-perforating devices B65H35/00; for leather or upholstery B68, C14B; for glass C03B; making matches C06F; for peat C10F; for sugar C13B45/00; for textile materials D06H; civil engineering, building, mining, see Section E; for light guides G02B6/25; cutting processed photographic material G03D15/04) ## Abstract A utility knife blade includes a portion made of a first material; and an elongated portion made of a second material, the second material being harder than the first material and coated on the first material by melting a powder of the second material on the first material, the elongated portion forming the tip of the blade, wherein the second material includes tungsten carbide particles embedded in a soft binder, and wherein the size of at least 90% of the tungsten carbide particles is lower than about 5 micrometers. ## Claims ### Claim 1 A utility knife blade comprising: a portion made of a first material; and an elongated portion made of a second material, the second material being harder than the first material and coated on the first material by melting a powder of the second material on the first material, the elongated portion forming the tip of the blade, wherein the second material includes tungsten carbide particles embedded in a soft binder, wherein the size of at least 90% of the tungsten carbide particles is lower than about 5 micrometers, and wherein said portion made of the first material includes a region, in contact with the second material, that has been hardened during deposition of the second material on the first material so that said hardened region has a hardness lower than a hardness of the second material and greater than a hardness of the first material. ### Claim 2 (depends on 1) The utility knife blade of claim 1, wherein the second material includes carbon in a range from about 3 to 7%. ### Claim 3 (depends on 2) The utility knife blade of claim 2, wherein the carbon is in a range from about 5 to 5.5%. ### Claim 4 (depends on 1) The utility knife blade of claim 1, wherein the powder is made of particles having a size in a range from about 15 to 45 micrometers. ### Claim 5 (depends on 4) The utility knife blade of claim 4, wherein the powder is made of particles having a size in a range from about 25 to 35 micrometers. ### Claim 6 (depends on 1) The utility knife blade of claim 1, wherein the size of at least 95% of the tungsten carbide particles is lower than about 2 micrometers. ### Claim 7 (depends on 6) The utility knife blade of claim 6, wherein the size of at least 99% of the tungsten carbide particles is lower than about 2 micrometers. ### Claim 8 (depends on 1) The utility knife blade of claim 1, wherein the soft binder includes cobalt and chromium. ### Claim 9 (depends on 1) The utility knife blade of claim 1, wherein the second material includes cobalt in a range from about 8 and 12% and chromium in a range from about 2 to 5%. ### Claim 10 (depends on 9) The utility knife blade of claim 9, wherein the cobalt is in a range from about 9.5 to 10.5% and the chromium is in a range from about 3.5 to 4.5%. ### Claim 11 (depends on 1) The utility knife blade of claim 1, wherein the powder has a density in a range from about 2 and 6 grams per cubic centimeter. ### Claim 12 (depends on 1) The utility knife blade of claim 1, wherein the powder has a density in a range from about 3 and 5 grams per cubic centimeter. ### Claim 13 (depends on 1) The utility knife blade of claim 1, wherein the powder is made of substantially hollow particles having a size in a range from about 15 to 45 micrometers. ### Claim 14 (depends on 1) The utility knife blade of claim 1, wherein the size of the tungsten carbide particles after coating the second material on the first material is substantially the same as the size of the tungsten carbide particles in the powder. ### Claim 15 (depends on 1) The utility knife blade of claim 1, wherein the second material is coated on the first material by laser deposition. ### Claim 16 (depends on 1) The utility knife blade of claim 1, wherein the hardness of the second material is greater than about 1,100 Hv. ### Claim 17 (depends on 1) The utility knife blade of claim 1, wherein the hardness of the first material is in a range from about 500 Hv to about 700 Hv. ### Claim 18 (depends on 17) The utility knife blade of claim 17, wherein the hardness of the first material is in a range from about 630 Hv to about 650 Hv. ### Claim 19 (depends on 1) The utility knife blade of claim 1, wherein a thickness of the second material along a cross section of said blade is in a range from about 0.1 mm to about 0.3 mm. ### Claim 20 (depends on 1) The utility knife blade of claim 1, wherein the first material is steel. ### Claim 21 (depends on 1) The utility knife blade of claim 1, wherein voids in the second material represent less than about 1% of a total volume of the second material.