US3625792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabricating glass-plastic windows
Assignee: PPG Industries Inc
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Filing: 1970-04-27
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Granted: 1971-12-07
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Expires: 1990-04-27
Abstract
Abstract A technique for fabricating unbalanced, transparent, glassplastic windows incorporating a technique to compensate for distortion effects similar to the action of a bimetal during the time-temperature-pressure cycle involved in lamination.
Inventors
- 👤 Paul E Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:44
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10128; B32B17/10137; B32B17/10018; B32B17/1055; B32B17/10761; B32B17/1077; B32B17/10798; B32B17/10807; B32B17/10816; B32B17/10825; B32B17/10834; B32B17/10844; B32B17/10853; B32B27/00; B64; B64C; B64C1/00; B64C1/14; B64C1/1476; B64C1/1484; B32B2333/00; B32B2333/04; B32B2333/12; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/1031
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
118 words
A method as in claim 1, wherein said predetermined shape of said glass sheet is obtained by duplicating the shape of said glass sheet produced by laminating an assembly of a glass sheet and a transparent sheet of plastic, both individually bent to the ultimate shape desired, and assembled in opposite order from the arrangement of the ultimate assembly to form a reverse order assembly, and laminated while so assembled in said reverse order with an interlayer under approximately identical conditions of elevated temperature, elevated pressure and time as those to which said window assembly of said glass sheet bent to said predetermined shape, said sheet of plastic bent to said conforming shape and said interlayer is subjected.
Claim 2
Dependent Claim
73 words
A method as in claim 1, wherein said transparent window comprises a plurality of sheets of transparent plastic with adjacent sheets of said transparent plastic separated by an additional interlayer and each additional transparent sheet of plastic is bent to a predetermined shape conforming to the conforming shape of its adjacent sheet of transparent plastic and compensating for the combined thickness of said additional plastic interlayer and said adjacent sheet of transparent plastic.
Claim 3
Dependent Claim
144 words
A method as in claim 3, wherein said predetermined shape of said glass sheet and said predetermined conforming shapes of each said sheets of transparent plastic are obtained by duplicating the shapes of the individual sheets produced by laminating an assembly of a glass sheet and a plurality of transparent sheets of plastic, all individually bent to the ultimate shape desired and assembled in opposite order from the arrangement of the ultimate window assembly with a layer of interlayer material between adjacent sheets to form a reverse order assembly, and laminated while so assembled in said reverse order under approximately identical conditions of elevated temperature, elevated pressure and time as those to which said window assembly comprising said glass sheet bent to said predetermined shape, said sheets of plastic bent to said predetermined conforming shapes and said interlayers are subjected during said final lamination.
Claim 4
Independent Claim
200 words
A method of producing an unbalanced, curved, glass-plastic laminated window comprising a plurality of sheets of transparent material arranged in asymmetrical relation with respect to the center of the thickness of the window comprising: a. individually shaping each of a plurality of sheets to conform with the shape required in said window, b. assembling said sheets with plastic interlayers separating adjacent of said sheets of transparent material in the reverse order of that required in said window to form a reverse order assembly, c. laminating said reverse order assembly according to a time-temperature-pressure cycle approximating a predetermined laminating cycle, thereby forming a laminate that does not conform to the shape desired for said window, d. forming a mold conforming to the shape of each of said sheets of said nonconforming laminate, e. shaping a sheet to each of the molds formed according to step (d), f. assembling said sheets shaped as in step (e) with plastic interlayers separating adjacent of said shaped sheets in the order required for said window to form a proper order assembly, g. laminating said proper order assembly according to said time-temperature-pressure cycle of said predetermined laminating cycle, and h. cooling said laminated assembly so formed.
Claim 5
Dependent Claim
15 words
A method of claim 5, wherein said plastic interlayers are sheets of plasticized polyvinyl butyral.
Claim 6
Dependent Claim
13 words
A method as in claim 5, said plastic interlayers are composed of polyurethane.
Claim 7
Dependent Claim
14 words
A method as in claim 5, wherein said plastic interlayers are composed of silicone.
Claim 8
Dependent Claim
33 words
A method as in claim 5, wherein said laminated wIndow is curved to have an exposed convex surface and an exposed concave surface, and said sheet forming said exposed convex surface is glass.
Claim 9
Dependent Claim
20 words
A method as in claim 9, wherein said glass sheet is chemically tempered by ion exchange prior to its assembly.
Claim 10
Dependent Claim
22 words
A method as in claim 9, wherein said sheet forming said exposed concave surface of said laminated window is an acrylic plastic.
Claim 11
Dependent Claim
21 words
A method as in claim 11, wherein said glass sheet and said acrylic plastic sheet so treated are of different thickness.
Claim 12
Dependent Claim
22 words
A method as in claim 9, wherein said sheet forming said exposed concave surface of said laminated window is a polycarbonate resin.
Claim 13
Dependent Claim
18 words
A method as in claim 13, wherein said glass sheet and said polycarbonate sheet are of different thickness.
Claim 14
Dependent Claim
17 words
A method as in claim 9, wherein said glass sheet is thermally tempered prior to its assembly.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |