US3769138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and a method for preparing a composite laminated sheet
Assignee: Individual
•
Filing: 1968-12-12
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Granted: 1973-10-30
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Expires: 1988-12-12
Abstract
Abstract A method for continuously producing a laminated composite sheet comprising at least two metal layers; the method comprising the steps of coating a very thin foil of a valuable metal with an adhesive medium and joining it under pressure to the face of a thicker metal sheet which has been prior to said joining, covered with a layer of thermoplastic material.
Inventors
- 👤 D Robbiati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:22
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/01; B32B15/04; B32B15/08; B32B2311/00; B32B2311/24; B32B2311/30; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
21 words
The method as set forth in claim 1, wherein said adhesive medium consists of polyvinyl chloride-acetate copolymer dissolved in a solvent.
Claim 2
Dependent Claim
90 words
The method as set forth in claim 1, including the further steps of passing said coated relatively thin sheet of metal through a first furnace wherein said sheet is heated to a temperature ranging from 70* - 90* C and wherein said solvent is at least partially evaporated; and thereafter, and prior to the joining under pressure step, passing said coated relatively thin sheet of metal through a second furnace wherein said sheet is heated to a temperature ranging from 140*-170* C and wherein said dried adhesive medium is regenerated.
Claim 3
Dependent Claim
17 words
The method as set forth in claim 1, wherein said layer of thermoplastic material contains plasticized polyvinyl.
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) | 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 |