Patent US2412515A successfully refreshed from Google Patents.
US3769133A
Expired / Lapsed
US
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Method for manufacture of laminated sheet material
Assignee: Compagnie de Saint Gobain SA
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Filing: 1970-08-31
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Granted: 1973-10-30
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Expires: 1990-08-31
Abstract
Abstract Method and apparatus for the manufacture of laminated sheets, such as outer laminae of glass with interposed lamina of thermoplastic. The superposed laminae are placed in an envelope having at least one wall flexible. The envelope has at least one side edge open but is otherwise air-tight. The laminae and envelope are placed in an evacuable chamber such as an autoclave. The air pressure is reduced to a few mm of Hg thus degassing the laminar sandwich. The open side edge of the envelope is then sealed while within the autoclave, under low absolute pressure. The assembly of envelope and laminae are then processed under heat and pressure, to unite the laminae into a unitary sheet. The processing may be done while the assembly remains in the autoclave. The completed sheet may be left in its envelope until removed for use.
Inventors
- 👤 W Nuding
- 👤 H Steffens
- 👤 F Halberschmidt
- 👤 K Linberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:07
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/02; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10807; B32B17/10816; B32B17/10825; B32B17/10834; B32B17/10844; B32B17/10853; B32B15/00; B32B15/20; B32B27/00; B32B27/32; B32B27/34; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/70; B32B2307/724; B32B2307/7242
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
34 words
The method of claim 1, said sealing of the envelope opening being effected by the application to said edge portions of heat at a temperature in excess of the sealing temperature of the sandwich.
Claim 2
Dependent Claim
24 words
The method of claim 1, said assembly being subjected to superatmospheric absolute pressure while confined within the chamber during said heating of the chamber.
Claim 3
Dependent Claim
35 words
The method as defined in claim 1 wherein the forming of the sandwich comprises assembling two sheets of material of complementary shape in face to face relation and an intermediate layer of thermoplastic material therebetween.
Claim 4
Dependent Claim
14 words
A method as defined in claim 4 wherein said intermediate layer is polyvinyl butyral.
Claim 5
Independent Claim
122 words
The method of fabricating a laminated sheet of material, comprising, forming a sandwich of at least two laminae which may be conjoined by heat and pressure, inserting the sandwich in a flexible sack comprising thermo-sealing material open along an edge to leave a loading opening, said sack being of material impervious to gas, placing the assembly of sack and sandwich within an evacuable chamber, evacuating the chamber and thereby reducing the pressure within the sack to a low subatmospheric absolute value, sealing the opening in the evacuated sack by heat to make it air tight, heating the chamber to the sealing temperature of the sandwich and increasing the absolute pressure within the chamber to at least atmospheric pressure, and cooling the assembly.
Claim 6
Dependent Claim
21 words
The method as defined in claim 6 wherein the sack comprises two sheets sealed to one another at the edges thereof.
Claim 7
Dependent Claim
14 words
The method of claim 7 in which a sheet of the sack comprises metal.
Claim 8
Dependent Claim
18 words
The method of claim 7 in which a sheet of the sack comprises inner and outer superposed layers.
Claim 9
Dependent Claim
12 words
The method of claim 9 in which the inner layer is polypropylene.
Claim 10
Dependent Claim
14 words
The method as defined in claim 9 wherein the said outer layer is polyamide.
Claim 11
Dependent Claim
35 words
The method as defined in claim 6 wherein the inner surface of the sack comprises material which will not adhere to the lamina of the sandwich adjacent thereto at said sealing temperature of the sandwich.
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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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |