Patent US3791387A successfully refreshed from Google Patents.
Patent US3561493A successfully refreshed from Google Patents.
US3561493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite tubes and method of manufacturing same
Assignee: Individual
•
Filing: 1965-04-21
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Granted: 1971-02-09
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Expires: 1985-04-21
Abstract
Abstract This invention is addressed to a tube formed of a plurality of interbonded layers of plastic material in which the plastic material in one layer differs from the plastic material in others with the adjacent layers of different plastic materials being interbonded with a layer formed of a precompounded mixture of the plastic materials making up the adjacent layers and extruded between said layers.
Inventors
- 👤 Paul Maillard
- 👤 Michel Rebeyrolle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:51
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/04; F16L11/045; F16L59/00; F16L59/14; F16L9/00; F16L9/12; F16L9/121; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/1393
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
A plastic tube as claimed in claim 1 wherein said inner layer is polyundecanamide.
Claim 2
Dependent Claim
39 words
A plastic tube as claimed in claim 1 wherein said intermediate layer is a less than perfectly homogeneous mixture having the proportions by weight of between 50 and 70 per cent polyolefin and 50 and 30 per cent polyamide.
Claim 3
Dependent Claim
75 words
A plastic tub tube comprising an outer continuous tubular fused layer of a polyolefin, a continuous inner tubular fused layer of a polyamide, and an intermediate continuous fused layer of a plastic material composed of a mixture of the plastic materials making up the inner and outer layers in uniform distribution with the intermediate layer interbonding by fusion substantially throughout the interfaces with the outer continuous layer and inner continuous layer of different plastic materials.
Claim 4
Dependent Claim
53 words
A plastic tube as claimed in claim 5 in which the mixture of materials present in the intermediate and interbonding layer are present in the proportion of 5- 95 parts by weight of the plastic material in one layer and 95- 5 parts by weight of the plastic material in the other layer.
References Cited (Backward Citations)
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Cited
US2645249A
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US2867241A
Cited
US3009207A
Cited
US3114409A
Cited
US3184358A
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US3223761A
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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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |