# US 12,109,788 B2 · Polymer safety glazing for vehicles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,109,788 B2 - Document ID: US12109788B2 - Status: Granted - Kind: B2 - Application number: 18/182,274 - Filed: 2023-03-10 - Published: 2023-07-06 - Granted: 2024-10-08 - Earliest claimed: 2019-05-21 - Assignees: RO Technologies, LLC - Applicants: RO Technologies, LLC - Inventors: Stephen S. Wilson; Bart E. Wilson - Web page: https://patentgrep.com/patent/US12109788B2 ## CPC - B32B 27/365: {comprising polycarbonates} - B32B 1/00: Layered products having a non-planar shape - B32B 7/06: permitting easy separation - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - B32B 27/08: of synthetic resin - B32B 27/36: comprising polyesters - B32B 2250/244: All polymers belonging to those covered by group B32B27/36 - B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer - B32B 2255/26: Polymeric coating - B32B 2307/518: bi-axially - B32B 2307/536: Hardness - B32B 2307/71: Resistive to light or to UV - B32B 2307/732: Dimensional properties - B32B 2307/738: Thermoformability - B32B 2307/748: Releasability - B32B 2571/00: Protective equipment - B32B 2605/006: Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM ## Abstract A laminate includes a polycarbonate substrate and an ultraviolet hard coat film disposed on the polycarbonate substrate. The ultraviolet hard coat film may include a polyethylene terephthalate (PET) layer, an adhesive interposed between the PET layer and the polycarbonate substrate, and an exterior hard coat disposed on the PET layer opposite the polycarbonate substrate. The exterior hard coat may include UV stabilizers. The laminate may include additional ultraviolet hard coat films stacked on the ultraviolet hard coat film. The laminate may be thermoformed into the shape of a curved vehicle windshield. ## Claims ### Claim 1 A laminate comprising: a polycarbonate substrate; a film disposed on the polycarbonate substrate, the film including a first polyethylene terephthalate (PET) layer, a first adhesive interposed between the first PET layer and the polycarbonate substrate, and a first exterior hard coat disposed on the first PET layer opposite the polycarbonate substrate; and an interior hard coat disposed on the polycarbonate substrate opposite the first PET layer, the interior hard coat being softer than the first exterior hard coat. ### Claim 2 (depends on 1) The laminate of claim 1, wherein the polycarbonate substrate is 3-8 mm thick. ### Claim 3 (depends on 1) The laminate of claim 1, wherein the first PET layer is 2-6 mil thick. ### Claim 4 (depends on 1) The laminate of claim 1, wherein the first exterior hard coat is 2-10 microns thick. ### Claim 5 (depends on 1) The laminate of claim 1, wherein the first adhesive is a pressure sensitive adhesive. ### Claim 6 (depends on 1) The laminate of claim 1, wherein the film is a first of a plurality of films stacked on the polycarbonate substrate, the plurality of films including a second film disposed on the first film, the second film including a second PET layer, a second adhesive interposed between the second PET layer and the first film, and a second exterior hard coat disposed on the second PET layer opposite the first film. ### Claim 7 (depends on 6) The laminate of claim 6, wherein the first adhesive is stronger than the second adhesive. ### Claim 8 (depends on 1) The laminate of claim 1, wherein the laminate is thermoformed into the shape of a curved vehicle windshield. ### Claim 9 A method comprising: depositing a first hard coat on a first side of a polyethylene terephthalate (PET) carrier; coating a second side of the PET carrier, opposite the first side, with an adhesive; adhering the second side of the PET carrier to a first side of a polycarbonate substrate using the adhesive; and disposing an interior hard coat on a second side of the polycarbonate substrate opposite the first side, the interior hard coat being softer than the first hard coat. ### Claim 10 (depends on 9) The method of claim 9, wherein the PET carrier, the first hard coat, and the adhesive define a film, the method further comprising winding the film on a roll prior to the adhering. ### Claim 11 (depends on 10) The method of claim 10, further comprising: applying a removable liner to the second side of the PET carrier after the coating; and removing the removable liner from the second side of the PET carrier prior to the adhering. ### Claim 12 (depends on 10) The method of claim 10, wherein the PET carrier, the first hard coat, and the adhesive define a film, the method further comprising thermoforming the polycarbonate substrate with the adhered film to the shape of a curved vehicle windshield. ### Claim 13 (depends on 10) The method of claim 10, wherein the PET carrier, the first hard coat, and the adhesive define a first film, the method further comprising: depositing a second hard coat on a first side of a second PET carrier; coating a second side of the second PET carrier, opposite the first side, with a second adhesive; and adhering the second side of the second PET carrier to the first film using the second adhesive. ### Claim 14 (depends on 13) The method of claim 13, wherein the adhesive of the first film is stronger than the second adhesive. ### Claim 15 (depends on 13) The method of claim 13, wherein the second PET carrier, the second hard coat, and the second adhesive define a second film, the method further comprising thermoforming the polycarbonate substrate with the adhered first and second films to the shape of a vehicle windshield. ### Claim 16 (depends on 15) The method of claim 15, further comprising peeling off the second film to reveal the first film. ### Claim 17 (depends on 16) The method of claim 16, further comprising: depositing a new second hard coat on a first side of a new second PET carrier; coating a second side of the new second PET carrier, opposite the first side, with a new second adhesive; and adhering the second side of the new second PET carrier to the first film using the new second adhesive.