US4075381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated glass windshield and method of making same
Assignee: AGC Inc
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Filing: 1976-08-25
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Granted: 1978-02-21
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Expires: 1996-08-25
Abstract
Abstract A laminated glass windshield is manufactured by bonding glass plates having a thickness of 1.5 to 2.5 mm together wherein the peripheral portions of the outer surfaces of the glass plates are subjected to a plane compressive stress of 200 to 500 Kg/cm 2 .
Inventors
- 👤 Yasuhiko Furukawa
- 👤 Tsuyoshi Igarashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:40
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/025; C03B23/0258; B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10036; B32B17/10165; B32B17/10293; B32B17/1055; B32B17/10761; B32B17/10807; B32B17/10889; B32B27/00; B32B27/40; C03B23/0252; C03B27/00; C03B27/04; C03B27/0413; B32B2605/00; B32B2605/006; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24777; Y10T428/24942; Y10T428/24992; Y10T428/31; Y10T428/315; Y10T428/31504; Y10T428/31551; Y10T428/31627; Y10T428/3163
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A laminated glass windshield, which comprises: two sheets of shaped plate glass bonded together by an interposed plastic layer wherein each of said glass plates has a thickness of 1.5 to 2.5 mm and has a plane compressive stress of 200 to 500 Kg/cm 2 on the peripheral portions of the outer surface within 15 mm of the outer edge of said plates and a tensile strength inside and adjacent said peripheral portions of less than 80 Kg/cm 2 .
Claim 2
Dependent Claim
80 words
A laminated glass windshield, which comprises: two sheets of shaped plate glass bonded together by an interposed plastic layer wherein each of said glass plates has a thickness of 1.5 to 2.5 mm and has a plane compressive stress of 200 to 500 Kg/cm 2 on the peripheral portions of the outer surface within 15 mm of the outer edge of said plates and a tensile strength inside and adjacent said peripheral portions of less than 80 Kg/cm 2 .
Claim 3
Dependent Claim
85 words
A laminated glass windshield, which comprises: two sheets of shaped plate glass bonded together by an interposed plastic layer wherein each of said glass plates has a thickness of 1.5 to 2.5 mm, a plane compressive stress of 200 to 350 Kg/cm 2 on the peripheral portions of the outer surface within 15 mm of the outer edge of said plates and a plane tensile stress less than 80 Kg/cm 2 on the inside zone adjacent to the peripheral portion having said plane compressive stress.
Claim 4
Dependent Claim
85 words
A laminated glass windshield, which comprises: two sheets of shaped plate glass bonded together by an interposed plastic layer wherein each of said glass plates has a thickness of 1.5 to 2.5 mm, a plane compressive stress of 200 to 350 Kg/cm 2 on the peripheral portions of the outer surface within 15 mm of the outer edge of said plates and a plane tensile stress less than 80 Kg/cm 2 on the inside zone adjacent to the peripheral portion having said plane compressive stress.
Claim 5
Independent Claim
143 words
A method of making a laminated glass windshield, which comprises the steps of: simultaneously shaping by heating two superimposed sheets of glass plates having a thickness of 1.5 to 2.5 mm on a bending mold at 550° to 650° C; quenching the glass plates at a quenching rate of 85° to 150° C/minute at least in an annealing zone from 450° to 550° C such that a plane compressive stress of 200 to 500 Kg/cm 2 is imparted to the peripheral portions of the outer surface of the glass plates within 15 mm of the outer edge of said plates; arranging the glass plates such that between said plates is sandwiched a plastic layer and such that the face of each plate which has the plane compressive stress is faced outward; and bonding the arranged glass plates by heat-pressing to form said laminate.
Claim 6
Independent Claim
143 words
A method of making a laminated glass windshield, which comprises the steps of: simultaneously shaping by heating two superimposed sheets of glass plates having a thickness of 1.5 to 2.5 mm on a bending mold at 550° to 650° C; quenching the glass plates at a quenching rate of 85° to 150° C/minute at least in an annealing zone from 450° to 550° C such that a plane compressive stress of 200 to 500 Kg/cm 2 is imparted to the peripheral portions of the outer surface of the glass plates within 15 mm of the outer edge of said plates; arranging the glass plates such that between said plates is sandwiched a plastic layer and such that the face of each plate which has the plane compressive stress is faced outward; and bonding the arranged glass plates by heat-pressing to form said laminate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |