Patent US4350545A successfully refreshed from Google Patents.
US4350545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of laminating plastic sheets
Assignee: Individual
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Filing: 1981-05-18
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Granted: 1982-09-21
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Expires: 2001-05-18
Abstract
Abstract A method and apparatus for laminating a plurality of plastic layers together is disclosed in which the lamination is carried out under heat and pressure with at least all but one of the layers being gas permeable in order that any gases within or between layers may be vented to the atmosphere during lamination under said heat and pressure. If desired, all of the layers may be gas permeable. One or more of the gas permeable layers may be plastic powder which meets and consolidates into a continuous, integrated ply during lamination.
Inventors
- 👤 Armen Garabedian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:03
CPC Classifications
B; B32; B32B; B32B37/00; B32B37/14; B32B37/26; B32B27/00; B32B27/06; B32B27/08; B32B27/12; B32B37/10; B32B37/1018; G; G06; G06K; G06K19/00; G06K19/04; G06K19/041; B32B2310/00; B32B2310/08; B32B2310/0806; B32B2310/0825; B32B2327/00; B32B2327/06; B32B2327/12; B32B2327/18; B32B2425/00; B32B2429/00; B32B2607/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
186 words
The method of laminating a plurality of layers together comprising, selecting said layers to be laminated such that no more than one of said layers is gas impermeable, also selecting said layers such that at least one thereof is a layer of plastic powder and any other layers are pre-existing gas permeable thermoplastic film or sheet, placing said layers against one another to form an assembly, providing a gas release means on at least one side of said assembly, applying a fluid-like even pressure to said assembly by means of at least one flexible diaphragm which is positioned to exert pressure thereon when flexed by the application of positive or negative pressure thereto, heating said assembly sufficiently while under said fluid-like pressure to fuse said powder to form a continuous integrated ply, venting through said gas permeable layers of said assembly and through said gas release means any gases within or between the layers, said venting taking place at least in part during heating of said assembly, and continuing said heat and pressure for a time and at a temperature sufficient to laminate said layers together.
Claim 2
Independent Claim
186 words
The method of laminating a plurality of layers together comprising, selecting said layers to be laminated such that no more than one of said layers is gas impermeable, also selecting said layers such that at least one thereof is a layer of plastic powder and any other layers are pre-existing gas permeable thermoplastic film or sheet, placing said layers against one another to form an assembly, providing a gas release means on at least one side of said assembly, applying a fluid-like even pressure to said assembly by means of at least one flexible diaphragm which is positioned to exert pressure thereon when flexed by the application of positive or negative pressure thereto, heating said assembly sufficiently while under said fluid-like pressure to fuse said powder to form a continuous integrated ply, venting through said gas permeable layers of said assembly and through said gas release means any gases within or between the layers, said venting taking place at least in part during heating of said assembly, and continuing said heat and pressure for a time and at a temperature sufficient to laminate said layers together.
Claim 3
Dependent Claim
51 words
The method of claim 1 including selecting one of said layers to be impermeable, so placing said layers against one another that said impermeable layer is to one side of said assembly, and providing said gas release means on the side of said assembly opposite to that of the impermeable layer.
Claim 4
Dependent Claim
17 words
The method of claim 1 including applying a gas release means to both sides of said assembly.
Claim 5
Dependent Claim
37 words
The method of claim 3 including selecting one of said layers to be impermeable, and so placing said layers against one another that said impermeable layer has at least one gas permeable layer on each side thereof.
References Cited (Backward Citations)
US2268477A
Cited
US2851730A
Cited
GB822609A
Cited
US2978376A
Cited
GB1045279A
Cited
US3493451A
Cited
US3575756A
Cited
US3686383A
Cited
US4104101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |