# US 4,397,325 A · Abrasive article > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,397,325 A - Document ID: US4397325A - Status: Granted - Kind: A - Application number: 06/375,454 - Filed: 1982-05-06 - Granted: 1983-08-09 - Earliest claimed: 1980-08-12 - Assignees: Barristo, Ltd. - Inventors: Harry P. Van Roeyen - Web page: https://patentgrep.com/patent/US4397325A ## CPC - C25D 15/00: Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires - A45D 29/04: Nail files, e.g. manually operated - C25D 7/00: Electroplating characterised by the article coated - C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR - A45D: HAIRDRESSING OR SHAVING EQUIPMENT (wigs, toupees or the like A41G3/00, A41G5/00; hairdressers' chairs A47C1/04; hair cutting appliances, razors B26B); EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING ## Abstract Nail files and other abrasive articles have a structural base, such as a steel strip, coated with a slurry of a resin, such as an epoxide, and abrasive particles or grits, such as aluminum oxide, granules with sharp peaks and corners, of selected size and covered with one or more layers of electroplated metal, such as copper, nickel and chromium, forming a sheath surrounding the coated base and firmly anchoring the particles around the base. The electroplated metal has relatively thick valley portions covering the bases of the particles but only has relatively thin films over the peaks of the particles. In use, the thin coatings over the peaks of the particles are broken off, exposing the tip ends of the abrasive particles for effective abrasion of surfaces, such as fingernails, rubbed thereover. The thermosetting resin material provides the initial positioning and preliminary anchoring of the abrasive particles on the base, but the sheath of electroplated metals overlying the resin coating provides the permanent anchor for the particles. The particle sizes of the abrasive granules can be controlled so that opposite faces of the file or different portions of the same face can have regulated fine or coarse abrading action. ## Claims ### Claim 1 An abrasive device comprising a structural base, a coating of abrasive particle containing resin material on the base, and a sheath of plated metal overlying the resin coating and having thin frangible portions covering the peaks of the particles which are broken off during abrasion to expose the particles. ### Claim 2 A fingernail file comprising a thin metal finger having wide opposite faces, a first coating of resin and coarse abrasive grits on one face of the finger, a second coating of resin and fine abrasive grits on the opposite face of the finger, and a thin envelope of plated metal overlying the coatings and having only thin frangible portions covering grits projecting from the coatings and thick portions firmly anchoring the main body portions of the grits. ### Claim 3 A file comprising a metal strip, a slurry of abrasive granules and resin coated on the strip and a crust of electrodeposited metal covering the resin coating and anchoring the granules. ### Claim 4 (depends on 1) The device of claim 1 wherein the base is steel and the granules are aluminum oxide. ### Claim 5 (depends on 1) The device of claim 1 wherein the resin is an epoxide. ### Claim 6 (depends on 1) The device of claim 1 wherein the plated metal includes superimposed layers of different metals. ### Claim 7 (depends on 6) The device of claim 6 wherein the different metal layers include copper, nickel and chromium. ### Claim 8 (depends on 2) The file of claim 2 wherein the plated metal includes a strike coating of copper. ### Claim 9 (depends on 2) The file of claim 2 wherein the plated metal includes a plurality of layers of different metal. ### Claim 10 (depends on 3) The file of claim 3 wherein the resin is an epoxide. ### Claim 11 (depends on 3) The file of claim 3 wherein the crust has a plurality of layers of different metals. ### Claim 12 In an abrasive device, a base having a surface coated with a slurry of abrasive granules and cured plastics material resin with the resin constituent settled on the base exposing peaks of the granules and said peaks being etched free from said resin. ### Claim 13 (depends on 12) The abrasive device of claim 12 including a crust of electro-deposited metal covering the coating and anchoring the granules. ### Claim 14 An article with a friction surface which comprises a metal base, a sheath of abrasive particle containing resin material surrounding and anchored on the base, and a plurality of sheaths overlying the resin material sheath composed of plated metal having thin frangible peaks overlying the peaks of the granules which are broken off to expose the granule peaks during use of the article. ### Claim 15 (depends on 1) The article of claim 1 wherein the sheath of plated metal includes a bottom layer of non-electroplated metal on the resin coating. ### Claim 16 (depends on 1, 2) The file of claim 1 or 2 wherein the envelope or crust includes a layer of electroless deposited metal directly on the resin coating. ### Claim 17 (depends on 14) The article of claim 14 wherein the plated metal sheaths include a bottom sheath of non-electroplated metal directly on the resin material sheath. ### Claim 18 (depends on 15) The device of claim 15 wherein the non-electroplated metal is nickel. ### Claim 19 (depends on 16) The file of claim 16 wherein the electroless deposited metal is nickel. ### Claim 20 (depends on 17) The article of claim 17 wherein the non-electroplated metal is nickel.