US3623943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer composite plate
Assignee: Rio Tinto Switzerland AG
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Filing: 1970-06-01
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Granted: 1971-11-30
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Expires: 1990-06-01
Abstract
Abstract A multilayer composite plate having at least one cover layer from a nonferrous metal has a core made from a polyolefin layer with a melting region over 120* C., an adhesive layer of ethylene interpolymer containing a carboxyl group connects the polyolefin layer with the metal cover layer, and an intermediate layer from polyethylene with a melting region below 120* C. placed between the polyolefin layer and the adhesive layer.
Inventors
- 👤 Dietrich Altenpohl
- 👤 Jean Schrade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:46
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/26; Y10T428/266; Y10T428/269; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
37 words
The multilayer composite plate as claimed in claim 1, wherein said core layer has adhered to opposite major surfaces thereof two nonferrous metal cover layers by means of the sequence of intervening layers described in claim 1.
Claim 2
Dependent Claim
32 words
The multilayer composite plate as claimed in claim 1, wherein said core layer has a density of over 0.94 g./cm.3 and said intermediate layer has a density less than said core layer.
Claim 3
Dependent Claim
27 words
The multilayer composite plate, as claimed in claim 3, wherein said adhesive layer consists of a peroxide containing tertiary polymer of ethylene with acrylic acid and acrylate.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |