# US 10,864,761 B2 · Glass plate with an identification mark, and process for forming an identification mark on a glass plate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,864,761 B2 - Document ID: US10864761B2 - Status: Granted - Kind: B2 - Application number: 16/274,278 - Filed: 2019-02-13 - Published: 2019-08-29 - Granted: 2020-12-15 - Earliest claimed: 2018-02-27 - Assignees: AGC Inc. - Applicants: AGC Inc. - Inventors: Keiji Notsu; Yoshiaki Ohba - Web page: https://patentgrep.com/patent/US10864761B2 ## CPC - B41M 5/262: {recording or marking of inorganic surfaces or materials, e.g. glass, metal, or ceramics (marking of plastic artifacts with inorganic additives B41M5/267)} - B24B 9/10: of plate glass - B60J 1/00: Windows; Windscreens; Accessories therefor (B60J10/00 takes precedence; air curtains instead of windows B60J9/04 {; sealing strips for windshields B60J10/70; sealing sash guides for sliding window panes B60J10/74; glass partitions inside vehicles to protect occupants against personal attack B60R21/12}) - C03C 17/22: with other inorganic material (C03C17/34, C03C17/44 take precedence) - C03C 19/00: Surface treatment of glass, not in the form of fibres or filaments, by mechanical means (sand-blasting, grinding, or polishing glass B24) - C03C 23/0025: {by a laser beam} - B41M 5/24: Ablative recording, e.g. by burning marks; Spark recording {(marking by high energetic means, e.g. by laser otherwise than burning or ablative removal B41M5/26; materials or methods for recording or reproduction by optical means G11B7/00)} - C03C 2218/328: Partly or completely removing a coating - B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P) - B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS - B60J: WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES (fastening, suspending, closing, or opening of such devices E05) - C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS ## Abstract A glass plate with an identification mark and a process for forming an identification mark on a glass plate are configured such that the identification mark includes a plurality of first openings, each of the first openings further includes a plurality of second openings, each of which has a smaller area than each of the first openings, and each of the second openings is formed in a substantially circular shape having a radius of at least 0.05 mm and at most 0.3 mm. ## Claims ### Claim 1 A laminated glass with an identification mark, comprising: a first glass plate, a first light-shielding layer disposed on the first glass plate along a peripheral edge area of a principal surface of the first glass plate, and an identification mark formed in a region where the first light-shielding layer is disposed, wherein the identification mark comprises a plurality of first openings, and each of the first openings further comprises a plurality of second openings, each of which has a smaller area than each of the first openings, wherein each of the second openings is formed in a substantially circular shape having a radius of at least 0.05 mm and at most 0.3 mm, wherein a second glass plate is disposed, via an interlayer, on a principal surface of the first glass plate opposed to the principal surface of the first glass plate where the first light-shielding layer is disposed, wherein when the second glass plate has a second light-shielding layer disposed along a peripheral edge area of a principal surface thereof positioned on a car-interior side when the laminated glass is applied to an automobile opening, and wherein the second light-shielding layer of the second glass plate is positioned in a position to shield the identification mark when the second glass plate is bowled to the first glass plate via the interlayer. ### Claim 2 (depends on 1) The glass according to claim 1, wherein the second openings in the first light-shielding layer are formed so as to reach the first glass plate. ### Claim 3 (depends on 1) The glass according to claim 1, wherein the shortest distance between adjacent first openings is at most 0.2 mm. ### Claim 4 (depends on 1) The glass according to claim 1, wherein each of the first openings comprises at least two second openings which are partially overlapped each other. ### Claim 5 (depends on 1) The glass according to claim 1, wherein the identification mark comprises the first openings having different areas and/or different shapes. ### Claim 6 (depends on 1) The glass according to claim 1, wherein the identification mark is formed in the vicinity of an edge of the first glass plate. ### Claim 7 (depends on 1) The glass according to claim 1, wherein the first light-shielding layer has a thickness of at least 3 μm and at most 15 μm. ### Claim 8 (depends on 1) The glass according to claim 1, wherein the identification mark represents a one-dimensional code or two-dimensional code. ### Claim 9 A glass plate with an identification mark, comprising: a glass plate, a first light-shielding layer disposed on the glass Plate along a peripheral edge area of a principal surface of the glass plate, and an identification mark formed in a region where the first light-shielding layer is disposed, wherein the identification mark comprises a plurality of first openings, and each of the first openings further comprises a plurality of second openings, each of which has a smaller area than each of the first openings, wherein each of the second openings is formed in a substantially circular shape having a radius of at least 0.05 mm and at most 0.3 mm, wherein the identification mark is shielded by a dark material, and wherein the dark material comprises an adhesive comprising a dark pigment. ### Claim 10 (depends on 9) The glass plate according to claim 9, wherein the second openings in the first light-shielding layer are formed so as to reach the glass plate. ### Claim 11 (depends on 9) The glass plate according to claim 9, wherein the shortest distance between adjacent first openings is at most 0.2 mm. ### Claim 12 (depends on 9) The glass plate according to claim 9, wherein each of the first openings comprises at least two second openings which are partially overlapped each other. ### Claim 13 (depends on 9) The glass plate according to claim 9, wherein the identification mark comprises the first openings having different areas and/or different shapes. ### Claim 14 (depends on 9) The glass plate according to claim 9, wherein the identification mark is formed in the vicinity of an edge of the glass plate. ### Claim 15 (depends on 9) The glass plate according to claim 9, wherein the first light-shielding layer has a thickness of at least 3 μm and at most 15 μm. ### Claim 16 (depends on 9) The glass plate according to claim 9, wherein the identification mark represents a one-dimensional code or two-dimensional code. ### Claim 17 (depends on 9) A process for forming an identification mark on a glass plate according to claim 9 comprising: preparing a glass plate with a light-shielding layer disposed on the glass plate along a peripheral edge area of at least one of the principal surfaces of the glass plate, and applying a laser beam to the light-shielding layer to put an identification mark: applying the laser beam toward the light-shielding layer of the glass plate from a laser beam source, the laser beam having an output power of at least 2 W and at most 25 W, and forming a plurality of second openings in a substantially circular shape having a radius of at least 0.05 mm and at most 0.3 mm such that the second openings in the light-shielding layer are formed so as to reach the surface of the glass plate; forming each of a plurality of first openings by moving an irradiation position of the laser beam while forming the second openings; and forming the first openings to form the identification mark. ### Claim 18 (depends on 17) The process according to claim 17, wherein the forming of a first opening is performed such that the laser beam has an irradiation position movement speed of at least 200 mm/s and at most 3,000 mm/s. ### Claim 19 (depends on 17) The process according to claim 17, wherein the laser beam has a wavelength of 1.064 nm. ### Claim 20 (depends on 17) The process according to claim 17, wherein the forming of the second openings, the forming of a first opening, and the forming of the identification mark are performed in a darkroom. ### Claim 21 (depends on 17) The process according to claim 17, wherein at least one selected from ventilating treatment, exhausting treatment, sucking treatment, blowing treatment and dust-collecting treatment is performed, simultaneously with the application of the laser beam, in the vicinity of a region Where the laser beam is applied to the light-shielding layer.