Source: https://patents.google.com/patent/US9828277B2/en
Timestamp: 2020-08-03 18:52:52
Document Index: 588611731

Matched Legal Cases: ['Application No. 61', 'Application No. 2013', 'Application No. 2013', 'Application No. 200980153523', 'Application No. 201380009726', 'Application No. 201380009631', 'Application No. 201380009726', 'Application No. 2014', 'Application No. 200980153523', 'Application No. 200980153523']

US9828277B2 - Methods for separation of strengthened glass - Google Patents
Methods for separation of strengthened glass Download PDF
US9828277B2
US9828277B2 US13/778,950 US201313778950A US9828277B2 US 9828277 B2 US9828277 B2 US 9828277B2 US 201313778950 A US201313778950 A US 201313778950A US 9828277 B2 US9828277 B2 US 9828277B2
US13/778,950
US20130224439A1 (en
2013-02-27 Application filed by Electro Scientific Industries Inc filed Critical Electro Scientific Industries Inc
2013-02-27 Assigned to ELECTRO SCIENTIFIC INDUSTRIES, INC. reassignment ELECTRO SCIENTIFIC INDUSTRIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: XU, QIAN, ZHANG, HAIBIN
2013-08-29 Publication of US20130224439A1 publication Critical patent/US20130224439A1/en
2013-12-02 Priority claimed from US14/094,656 external-priority patent/US9828278B2/en
2017-11-28 Publication of US9828277B2 publication Critical patent/US9828277B2/en
239000006058 strengthened glasses Substances 0.000 title claims description 26
239000000758 substrates Substances 0.000 claims abstract description 256
230000000977 initiatory Effects 0.000 claims description 33
This application claims the benefit of U.S. Provisional Application No. 61/604,380, filed Feb. 28, 2012, which is hereby incorporated by reference in its entirety.
However the magnitude of compressive stress and the elastic energy stored within the central tension region may make cutting and finishing of chemically- or thermally-strengthened glass substrates difficult. The high surface compression and deep compression layers make it difficult to mechanically scribe the glass substrate as in traditional scribe-and-bend processes. Furthermore, if the stored elastic energy in the central tension region is sufficiently high, the glass may break in an explosive manner when the surface compression layer is penetrated. In other instances, the release of the elastic energy may cause the break to deviate from a desired separation path. Accordingly, a need exists for alternative methods for separating strengthened glass substrates.
One embodiment disclosed herein can be exemplarily characterized as a method (e.g., for separating a substrate) that includes: providing a substrate having a first surface and a second surface opposite the first surface, wherein at least one of the first surface and the second surface is compressively stressed and an interior of the substrate is under a state of tension; directing a beam of laser light to pass through the first surface and to pass through the second surface after passing through the first surface, wherein the beam of laser light has a beam waist at a surface of the substrate or outside the substrate; causing the beam of laser light to be scanned relative to the substrate along a guide path; removing material from a surface of the substrate at a plurality of locations along the guide path with the beam of laser light; and separating the substrate along the guide path.
Another embodiment disclosed herein can be exemplarily characterized as a method (e.g., for separating a substrate) that includes: providing a substrate having a first surface and a second surface opposite the first surface, wherein at least one of the first surface and the second surface is compressively stressed and an interior of the substrate is under a state of tension; machining the substrate at a plurality of positions within the substrate, wherein at least one of the plurality of machined positions is located at the second surface and at least one of the plurality of positions is located within the interior of the substrate; and separating the substrate along a guide path. The machining can include directing a beam of laser light to pass through the first surface and to pass through the second surface after passing through the first surface, wherein the beam of laser light has an intensity and a fluence in a spot at a surface of the substrate sufficient to stimulate multiphoton absorption of light by a portion of the substrate illuminated by the spot; and causing the beam of laser light to be scanned relative to the substrate such that at least some of the plurality of machined positions are arranged along a guide path.
Yet another embodiment disclosed herein can be exemplarily characterized as an apparatus for separating a substrate having a first surface and a second surface opposite the first surface, wherein the apparatus includes: a laser system configured to direct a focused beam of laser light along an optical path, the focused beam of laser light having a beam waist; a workpiece support system configured to support the strengthened glass substrate such that the first surface faces toward the laser system and such that the beam waist is locatable at a surface of the substrate or outside the substrate; and a controller coupled to at least of the laser system and the workpiece support system. The controller can include: a processor configured to execute instructions to control the at least of the laser system and the workpiece support system to: direct the beam of laser light to pass through the first surface and to pass through the second surface after passing through the first surface, wherein the beam of laser light has an intensity and a fluence in a spot at a surface of the substrate sufficient to stimulate multiphoton absorption of light by a portion of the substrate illuminated by the spot; and cause the beam of laser light to be scanned relative to the substrate along a guide path. The controller can further include a memory configured to store the instructions.
Still another embodiment disclosed herein can be exemplarily characterized as an article of manufacture that includes: a strengthened glass article having a first surface, a second surface and an edge surface. The edge surface can include: a primary edge region extending from the second surface toward the first surface; and a notch region extending from the primary edge region to the first surface.
C ⁢ ⁢ T = C ⁢ ⁢ S × D ⁢ ⁢ O ⁢ ⁢ L t - 2 × D ⁢ ⁢ O ⁢ ⁢ L
Having exemplarily described a substrate 100 capable of being separated according to embodiments of the present invention, exemplary embodiments of separating the substrate 100 will now be described. Upon implementing these methods, the substrate 100 can be separated along a guide path such as guide path 112. Although guide path 112 is illustrated as extending in a straight line, it will be appreciated that all or part of the guide path 112 may extend along a curved line.
FIGS. 2A to 5 illustrate one embodiment of a process of separating a strengthened glass substrate such as substrate 100, which includes forming a guide trench in the substrate 100 and then separating the substrate 100 along the guide trench. Specifically, FIGS. 2A and 2B are top plan and cross-section views, respectively, illustrating one embodiment of a process of forming the guide trench; FIGS. 3A and 3B are cross-section and side plan views, respectively, illustrating one embodiment of a guide trench formed according to the process exemplarily described with respect to FIGS. 2A and 2B; and FIGS. 4 and 5 are cross-section views illustrating one embodiment of a process of separating a substrate along the guide trench exemplarily described with respect to FIGS. 2A-3B.
Generally, the beam 202 of laser light is directed onto the substrate along an optical path such that the beam 202 passes through the first surface 102 and, thereafter, through the second surface 104. In one embodiment, the light within the beam 202 is provided as a series of pulses of laser light and the beam 202 can be directed along the optical path by first producing a beam of laser light and then subsequently focusing the beam of laser light to produce the beam waist 204. In the illustrated embodiment, the beam waist 204 is located outside the substrate 100 such that beam waist 204 is closer to the second surface 104 than the first surface 102. By locating the beam waist 204 outside the substrate 100, closer to the second surface 104 than the first surface 102, the beam 202 can be nonlinearly focused within the substrate 100 to damage the interior 110 of the substrate 100 within a long narrow region thereof (e.g., due to a balance of nonlinear Kerr effect, diffraction, plasma defocusing, etc.), which can facilitate subsequent separation of the substrate 100. By changing the manner in which the beam 202 is focused, however, the beam waist 204 can be provided closer to the second surface 104 than the first surface 102. In still other embodiments, the beam waist 204 can intersect the first surface 102 (so as to be at the first surface 102) or the second surface 104 (so as to be at the second surface 104).
In the illustrated embodiment, the beam waist 204 is located outside the substrate 100 so as to be spaced apart from the substrate (e.g., when measured along the optical path) by a distance greater than 0.5 mm. In one embodiment, the beam waist 204 is spaced apart from the substrate 100 by a distance less than 3 mm. In one embodiment, the beam waist 204 can be spaced apart from the substrate 100 by a distance of 1.5 mm. It will be appreciated, however, that the beam waist 204 can be spaced apart from the substrate 100 by a distance greater than 3 mm or less than 0.5 mm. In some embodiments, the distance by which the beam waist 204 is spaced apart from the substrate 100 can be selected based on whether the beam waist 204 is closer to the first surface 102 or the second surface 104. As will be discussed in greater detail below, the distance by which the beam waist 204 is spaced apart from the substrate 100 can be selected based on the desired configuration of a guide trench used to aid in separation of the substrate 100.
Generally, light within the beam 202 of laser light has at least one wavelength greater than 100 nm. In one embodiment, light within the beam 202 of laser light can have at least one wavelength less than 3000 nm. For example, light within the beam 202 of laser light can have a wavelength of 523 nm, 532 nm, 543 nm, or the like or a combination thereof. As mentioned above, light within the beam 202 is provided as a series of pulses of laser light. In one embodiment, at least one of the pulses can have a pulse duration greater than 10 femtoseconds (fs). In another embodiment, at least one of the pulses can have a pulse duration less than 500 nanoseconds (ns). In yet another embodiment, at least one pulse can have a pulse duration of about 10 picoseconds (ps). Moreover, the beam 202 may be directed along the optical path at a repetition rate greater than 10 Hz. In one embodiment, the beam 202 may be directed along the optical path at a repetition rate less than 100 MHz. In another embodiment, the beam 202 may be directed along the optical path at a repetition rate of about 400 kHz. It will be appreciated that the power of the beam 202 may be selected based on, among other parameters, the wavelength of light within the beam 202 and the pulse duration. For example, when the beam 202 has a green wavelength (e.g., 523 nm, 532 nm, 543 nm, or the like) and a pulse duration of about 10 ps, the power of the beam 202 may have a power of 20 W (or about 20 W). In another example, when the beam 202 has a UV wavelength (e.g., 355 nm, or the like) and a pulse duration of about less than 10 ns (e.g., 1 ns), the power of the beam 202 may have a power in a range from 10 W-20 W (or from about 10 W to about 20 W). It will be appreciated, however, that the power of the beam 202 may be selected as desired.
Generally, the beam 202 can be scanned between the two points A and B along a guide path 112 at least once. In one embodiment, the beam 202 is scanned between the two points along the guide path at least 5 times. In another embodiment, the beam 202 is scanned between the two points along the guide path at least 10 times. Generally, the beam 202 can be scanned between the two points along at least a portion of the guide path 112 at a scan rate greater than or equal to 1 m/s. In another embodiment, the beam 202 is scanned between the two points along at least a portion of the guide path 112 at a scan rate greater than 2 m/s. It will be appreciated, however, that the beam 202 may also be scanned between the two points along at least a portion of the guide path 112 at a scan rate less than 1 m/s. For example, the beam 202 can be scanned at a scan rate of 80 mm/s, 75 mm/s, 50 mm/s, 30 mm/s, or the like. It will also be appreciated that the scan rate and the number of times the beam 202 is scanned between the two points A and B can be selected based on the aforementioned beam parameters, as well as desired depth of the guide trench 200 composition of the substrate, edge quality desired of pieces separated from the substrate 100.
Guide trench parameters such as the width (e.g., denoted at “w1”, see FIG. 2A), depth (e.g., denoted at “d2”, see FIG. 3A), location of an end of the guide trench 200, cross-sectional profile, and the like, can be selected by adjusting one or more scanning parameters, beam waist placement parameters and/or the aforementioned beam parameters. Exemplary scanning parameters include the aforementioned scan rate, number of times to scan between points A and B, or the like or a combination thereof. Exemplary beam waist placement parameters include whether or not the beam waist 204 is located outside the substrate 100 and how far the beam waist 204 is spaced apart from the substrate 100, whether or not the beam waist 204 is closer to the first surface 102 or the second surface 104, whether or not the beam waist 204 is at the first surface 102 or the second surface 104, or the like or a combination thereof. Upon completing the guide trench-forming process, a guide trench 200 is formed as shown in FIGS. 3A and 3B.
Referring to FIGS. 3A and 3B, the depth d2 of the guide trench 200, at any location along the guide path 112, can be defined as the distance from the physical surface of the substrate 100 in which it is formed (e.g., the first surface 102, as exemplarily illustrated) to the lower surface 300 of the guide trench 200. Depending on the aforementioned beam parameters, scanning parameters, and beam waist placement parameters, d2 can be greater than d1, equal to d1 or less than d1 at any location along the guide path 112. When d2 is greater than d1, d2 can be in a range of 5% (or less than 5%) to 100% (or more than 100%) greater than d1. When d2 is less than d1, d2 can be in a range of 1% (or less than 1%) to 90% (or more than 90%) less than d1. In one embodiment, the aforementioned beam parameters, scanning parameters, beam waist placement parameters, and the like, can be selected such that d2 can be greater than 30 μm. In another embodiment, d2 can be less than 50 μm. In still another embodiment, d2 can be about 40 μm.
Referring to FIG. 3B, the aforementioned beam parameters, scanning parameters, beam waist placement parameters, and the like, can be selected to adjust the radius of curvature of the lower surface 300. Depending on the aforementioned beam parameters, scanning parameters, beam waist placement parameters, substrate parameters (e.g., substrate composition, compression region depth, magnitude of compressive stresses within a compression region, magnitude of tensile stresses within a tension region, or the like or a combination thereof), or the like or a combination thereof, guide trench parameters (e.g., the depth d2 of the guide trench 200, the radius of curvature of the guide trench 200, location of the end 302 of the guide trench 200 relative to the edge of the substrate 100, or the like) can be selected to promote desirable separation of the substrate 100 along the guide path 112. For example, if the depth d2 is too small and/or if the radius of curvature is too large, the substrate 100 may separate along a path that undesirably deviates away from the guide path 112, or may undesirably produce small cracks in the substrate 100 that can reduce the strength of pieces of strengthened glass that are separated from the substrate 100.
In one embodiment, a vent crack initiator system such as vent crack initiator system 718 may be included within the apparatus 700. The vent crack initiator system 718 can include a vent crack initiator device 720 operative to form the aforementioned initiation trench 400. The vent crack vent crack initiator device 720 may be coupled to a positioning assembly 722 (e.g., a dual-axis robot) configured to move the vent crack initiator device 720 (e.g., along a direction indicated by one or both of arrows 718 a and 718 b). The vent crack initiator device 720 may include a grinding wheel, a cutting blade, a laser source, an etchant nozzle or the like or a combination thereof. In another embodiment, another vent crack initiator system may include a laser, such as laser 724, operative to generate a beam of light and direct the beam of light into the aforementioned laser system facilitate formation of the initiation trench 400. In yet another embodiment, another vent crack initiator system may include a supplemental laser system configured to generate a beam 726 of laser light sufficient to form the initiation trench 400 as exemplarily described above. Accordingly, the supplemental laser system can include a laser 728 operative to generate a beam 728 a of light an optical assembly 730 configured to focus the beam 728 a direct the beam 726 to the substrate 100.
providing a strengthened glass substrate having a first surface and a second surface opposite the first surface, wherein the substrate has a thickness between the first surface and the second surface, wherein at least one of the first surface and the second surface is compressively stressed to a depth of layer forming a compression region and an interior of the substrate is under a state of tension, wherein the compression region extends from the second surface into the interior of the substrate, wherein the compression region has a compression region thickness, and wherein the substrate also comprises a tension region adjacent to the compression region;
directing a beam of laser light having a wavelength greater than 100 nm and less than 3000 nm to pass through the first surface and to pass through the second surface after passing through the first surface, wherein the beam of laser light has a beam waist outside the substrate;
causing the beam of laser light to be scanned relative to the substrate along a guide path, including scanning the beam of laser light between two end points on the guide path at least once;
removing material from the second surface of the substrate at a plurality of locations along the guide path with the beam of laser light, wherein the beam waist is positioned closer to the second surface than the first surface during removal of the material, and wherein the material is removed to a trench depth to form a guide trench extending into the substrate to the trench depth, wherein the trench depth is greater than or equal to 1% of the compression region thickness and less than or equal to 100% of the compression region thickness; and
2. The method of claim 1, wherein the compression region thickness is greater than 10 μm.
3. The method of claim 2, wherein the compression region thickness is greater than 50 μm.
4. The method of claim 1, wherein light within the beam of laser light has at least one wavelength in the ultraviolet spectrum.
5. The method of claim 1, further comprising scanning the beam of laser light between the two end points along the guide path at least 5 times.
6. The method of claim 1, further comprising scanning the beam of laser light along at least a portion of the guide path at a scan rate greater than 1 m/s.
7. The method of claim 1, wherein at least a portion of the guide path extends in a straight line along the first surface.
8. The method of claim 1, wherein at least a portion of the guide path extends in a curved line along the first surface.
9. The method of claim 1, wherein the guide trench depth of at least a portion of the guide trench is less than the compression region thickness.
10. The method of claim 1, wherein the guide trench is configured such that substrate is separable along the guide path upon forming the guide trench.
11. The method of claim 1, wherein the guide trench is configured to ensure that the substrate is prevented from spontaneously separating along the guide trench during formation of the guide trench between the two endpoints and such that substrate remains united upon forming the guide trench, wherein separating the substrate comprises forming a vent crack within the substrate after forming the guide trench, and wherein the vent crack and the guide trench are configured such that the substrate is separable along the guide trench upon forming the vent crack.
12. The method of claim 1, wherein the beam of laser light has an intensity and a fluence in a spot at the second surface of the substrate sufficient to stimulate multiphoton absorption of light by a portion of the substrate illuminated by the spot.
13. The method of claim 1, wherein, during the step of removing material from the second surface of the substrate, the beam of laser light is nonlinearly focused within the substrate to damage the interior of the substrate to facilitate the step of separating the substrate that is subsequent to and distinct from the step of removing material from the second surface of the substrate.
14. The method of claim 13, wherein the damage to the interior of the substrate is caused by one or more of: a nonlinear Kerr effect, diffraction, and plasma defocusing.
15. The method of claim 1, wherein the substrate comprises strengthened glass, wherein the substrate has an edge extending between the first surface and the second surface, and wherein an end point is spaced apart from the edge.
16. The method of claim 15, wherein causing the beam of laser light to be scanned relative to the substrate along the guide path comprises scanning the beam of laser light between the two end points on the guide path multiple times, wherein guide trench parameters are selected to ensure that the substrate is prevented from spontaneously separating along the guide trench during formation of the guide trench between the two end points.
17. The method of claim 16, wherein the trench depth is greater than 30 μm.
18. The method of claim 15, wherein the guide trench is configured to ensure that the substrate is prevented from spontaneously separating along the guide trench during formation of the guide trench between the two end points and such that substrate remains united upon forming the guide trench, wherein separating the substrate comprises forming a vent crack within the substrate after forming the guide trench, and wherein the vent crack and the guide trench are configured such that the substrate is separable along the guide trench upon forming the vent crack.
19. The method of claim 18, wherein the vent crack results from formation of an initiation trench between the edge and the end point spaced apart from the edge, and wherein, upon formation of the initiation trench, the vent crack spontaneously propagates along the guide trench to separate the substrate.
20. The method of claim 19, wherein the initiation trench has an initiation depth that is greater than the trench depth of the guide trench.
21. The method of claim 18, wherein the vent crack results from formation of an initiation trench within the guide trench, and wherein, upon formation of the initiation trench, the vent crack spontaneously propagates along the guide trench to separate the substrate.
providing a strengthened glass substrate having a first surface and a second surface opposite the first surface, wherein at least one of the first surface and the second surface is compressively stressed to a depth of layer forming a compression region, wherein an interior of the substrate is under a state of tension, wherein the compression region extends from the second surface into the interior of the substrate to the depth of layer, and wherein the tension region is adjacent to the compression region;
machining the substrate at a plurality of positions within the substrate, wherein at least one of the plurality of machined positions is located at the second surface and at least one of the plurality of positions is located within the interior of the substrate, the machining comprising:
directing a beam of laser light having a wavelength greater than 100 nm and less than 3000 nm to pass through the first surface and to pass through the second surface after passing through the first surface, wherein the beam of laser light has a beam waist outside the substrate, and wherein the beam of laser light has an intensity and a fluence in a spot at the second surface of the substrate sufficient to stimulate multiphoton absorption of light by a portion of the substrate illuminated by the spot; and
causing the beam of laser light to be scanned relative to the substrate including scanning the beam of laser light between two end points on the guide path at least once such that at least some of the plurality of machined positions are arranged along a guide path, wherein machining the substrate comprises removing substrate material extending from the second surface into the interior of the substrate to form a guide trench extending into the substrate along the guide path, wherein the plurality of positions occur within a range of depths from the second surface wherein the guide trench has a guide trench depth that is greater than or equal to 1% of the depth of layer and less than or equal to 100% of the depth of layer; and
23. The method of claim 22, wherein the spot has an elliptical shape.
24. The method of claim 22, wherein, during the step of causing the beam of laser light to be scanned relative to the substrate, the beam of laser light is nonlinearly focused within the substrate to damage the interior of the substrate to facilitate the step of separating the substrate that is subsequent to and distinct from the step of causing the beam of laser light to be scanned relative to the substrate.
25. The method of claim 22, wherein the damage to the interior of the substrate is caused by one or more of: a nonlinear Kerr effect, diffraction, and plasma defocusing.
26. The method of claim 22, wherein the substrate has an edge extending between the first surface and the second surface, and wherein an end point is spaced apart from the edge.
27. The method of claim 26, wherein causing the beam of laser light to be scanned relative to the substrate comprises scanning the beam of laser light multiple times between the two end points along the guide path to form the guide trench, wherein guide trench parameters are selected to ensure that the substrate is prevented from spontaneously separating along the guide trench during formation of the guide trench between the two end points.
28. The method of claim 26, wherein the guide trench is configured to ensure that the substrate is prevented from spontaneously separating along the guide trench during formation of the guide trench between the two end points and such that substrate remains united upon forming the guide trench, wherein separating the substrate comprises forming a vent crack within the substrate after forming the guide trench, and wherein the vent crack and the guide trench are configured such that the substrate is separable along the guide trench upon forming the vent crack.
providing a strengthened glass substrate having a first surface and a second surface opposite the first surface, wherein the substrate has a thickness between the first surface and the second surface, wherein at least one of the first surface and the second surface is compressively stressed to a depth of layer forming a compression region and an interior of the substrate is under a state of tension, wherein the compression region extends from the first surface into the interior of the substrate, wherein the compression region has a compression region thickness, and wherein the substrate also comprises a tension region adjacent to the compression region;
directing a beam of laser light having a wavelength greater than 100 nm and less than 3000 nm to pass through the first surface and to pass through the second surface after passing through the first surface, wherein the beam of laser light has a beam waist at the second surface of the substrate;
removing material from the second surface of the substrate at a plurality of locations along the guide path with the beam of laser light, wherein the beam waist is positioned at the second surface of the substrate during removal of the material from the second surface, and wherein the material is removed to a trench depth to form a guide trench extending into the substrate to the trench depth, wherein the trench depth is greater than or equal to 1% of the compression region thickness and less than or equal to 100% of the compression region thickness; and
30. The method of claim 29, wherein, during the step of removing material from the first surface of the substrate, the beam of laser light is nonlinearly focused within the substrate to damage the interior of the substrate to facilitate the step of separating the substrate that is subsequent to and distinct from the step of removing material from the second surface of the substrate.
31. The method of claim 30, wherein the damage to the interior of the substrate is caused by one or more of: a nonlinear Kerr effect, diffraction, and plasma defocusing.
32. The method of claim 29, wherein the substrate comprises strengthened glass, wherein the substrate has an edge extending between the first surface and the second surface, wherein an end point is spaced apart from the edge, wherein causing the beam of laser light to be scanned relative to the substrate along the guide path comprises scanning the beam of laser light between the two end points on the guide path multiple times, wherein guide trench parameters are selected to ensure that the substrate is prevented from spontaneously separating along the guide trench during formation of the guide trench between the two end points.
33. The method of claim 29, wherein the substrate comprises strengthened glass, wherein the substrate has an edge extending between the first surface and the second surface, wherein an end point is spaced apart from the edge, wherein removing material from the second surface of the substrate comprises forming a guide trench extending into the substrate, wherein the guide trench is configured to ensure that the substrate is prevented from spontaneously separating along the guide trench during formation of the guide trench between the two end points and such that substrate remains united upon forming the guide trench, wherein separating the substrate comprises forming a vent crack within the substrate after forming the guide trench, and wherein the vent crack and the guide trench are configured such that the substrate is separable along the guide trench upon forming the vent crack.
34. The method of claim 33, wherein the vent crack results from formation of an initiation trench between the edge and the end point spaced apart from the edge, and wherein, upon formation of the initiation trench, the vent crack spontaneously propagates along the guide trench to separate the substrate.
US13/778,950 2012-02-28 2013-02-27 Methods for separation of strengthened glass Active US9828277B2 (en)
US14/094,656 Continuation-In-Part US9828278B2 (en) 2012-02-28 2013-12-02 Method and apparatus for separation of strengthened glass and articles produced thereby
US20130224439A1 US20130224439A1 (en) 2013-08-29
US9828277B2 true US9828277B2 (en) 2017-11-28
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US13/778,950 Active US9828277B2 (en) 2012-02-28 2013-02-27 Methods for separation of strengthened glass
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