US3808077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for laminating plastic to glass employing glass mold
Assignee: PPG Industries Inc
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Filing: 1971-09-16
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Granted: 1974-04-30
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Expires: 1991-09-16
Abstract
Abstract Fabricating a transparent, laminated window having an exposed sheet of plastic material softer than glass adhered to glass, such as a bilayer windshield consisting essentially of an outer glass sheet and an inner preformed sheet of polyurethane plastic produced by lamination under heat and pressure with the polyurethane sheet supported in pressurized engagement against a smooth surface of a mold, which is preferably a second glass sheet having a shape conforming to that of the glass sheet of the resulting laminated window. The windshield is fabricated by assembling a preformed plastic sheet between a glass sheet to be laminated thereto and the mold with a suitable parting material between the mold and the plastic sheet to facilitate separating the mold and the bilayer windshield readily after lamination is completed. The assembly is exposed to elevated heat and pressure to effect the lamination. Preferably, the mold has certain physical properties the same as the glass sheet to be laminated so as to minimize optical distortion of the preformed plastic during lamination.
Inventors
- 👤 R Rieser
- 👤 J Chabal
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; B32B17/1055; B32B17/10761; B32B17/10009; B32B17/10018; B32B17/10688; B32B17/1077; B32B17/10807; B32B17/10816; B32B17/10825; B32B17/10834; B32B17/10844; B32B17/10853; B32B17/10889; B32B17/10899; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/31504; Y10T428/3154; Y10T428/31551; Y10T428/31627; Y10T428/3163
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
37 words
A method As in claim 1, wherein said glass sheet to be laminated to said preformed sheet is in turn laminated to an additional transparent sheet disposed on the side opposite that assembled facing said preformed sheet.
Claim 2
Dependent Claim
13 words
A method as in claim 1, wherein said preformed sheet is a polyurethane.
Claim 3
Dependent Claim
25 words
A method as in claim 3, wherein an adhesive is applied to at least one interfacial surface between said preformed sheet and said glass sheet.
Claim 4
Dependent Claim
22 words
A method as in claim 1, wherein said mold and said glass sheet of said assembly have curved surfaces of matching configuration.
Claim 5
Dependent Claim
44 words
A method as in claim 5, wherein said glass sheet to be laminated is preshaped to a shape desired for said laminated curved window and has a convex surface and a concave surface and said preformed plastic sheet is assembled against said concave surface.
Claim 6
Dependent Claim
29 words
A method as in claim 1, wherein an adhesive is applied to at least one interfacial surface between said preformed sheet and said glass sheet to be laminated thereto.
Claim 7
Dependent Claim
28 words
A method as in claim 7, further including the step of removing air that may be entrapped in the interfaces of said assembly before said pressure subjection step.
Claim 8
Dependent Claim
51 words
A method as in claim 1, wherein said preformed sheet is polyvinyl butyral and said parting material becomes adherent to said preformed sheet under the elevated temperature and pressure conditions existing during said subjecting step, whereupon said parting material separates from said mold with said preformed sheet and said glass sheet.
Claim 9
Dependent Claim
28 words
A method as in claim 1, further including the step of removing air that may be entrapped in the interfaces of said assembly before said pressure subjection step.
Claim 10
Independent Claim
278 words
A method of making a transparent, laminated window comprising a smoothly surfaced layer of polyurethane laminated to a sheet of glass comprising: a. assembling a preformed sheet of polyurethane having approximately uniform thickness between 1 mil and 100 mils throughout its entire extent in aligned relation to a glass sheet having approximately uniform thickness between 50 mils and 250 mils to be laminated to said preformed polyurethane sheet to form a sub-assembly, b. assembling a glass mold more rigid than said preformed sheet throughout the temperature cycle associated with laminating and having a smooth, rigid surface that conforms to the shape of said glass sheet to be laminated and having physical properties compatible with those of said glass sheet throughout said temperature cycle in aligned relation to said polyurethane sheet with parting material that is separable from at least one of said mold and said preformed sheet interposed between said mold and said polyurethane sheet to form an assembly in which said smooth, rigid surface is positioned to apply pressure against said polyurethane sheet, c. maintaining said assembly in said assembled relationship while subjecting said assembly to elevated pressure of more than 50 pounds per square inch and an elevated temperature of approximately 200* to 400* F. for sufficient time to laminate said polyurethane sheet to said glass sheet and to develop a surface in said polyurethane sheet that reproduces said smooth, rigid surface, d. reducing said pressure and temperature applied to said assembly, and e. separating said polyurethane sheet with said glass sheet laminated thereto from said mold to form a transparent laminate having said surface in said polyurethane sheet a reproduction of said smooth, rigid surface.
Claim 11
Dependent Claim
72 words
A method as in claim 11, wherein said glass sheet is curved and has a convex surface and a concave surface and said preformed polyurethane sheet is assembled in aligned relation to said concave surface of said glass sheet to form said sub-assembly, whereby said glass sheet and said preformed polyurethane sheet are laminated to form a transparent, laminated window having a convex surface of glass and a concave surface of polyurethane.
Claim 12
Dependent Claim
31 words
A method as in claim 11, wherein aN adhesive is applied to at least one interfacial surface between said glass sheet and said preformed polyurethane sheet prior to assembling said sub-assembly.
Claim 13
Dependent Claim
28 words
A method as in claim 11, further including the step of removing air that may be entrapped in the interfaces of said assembly before said pressure subjection step.
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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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |