US3784428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making carbon filament tapes
Assignee: Akzo Nobel UK PLC
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Filing: 1971-05-07
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Granted: 1974-01-08
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Expires: 1991-05-07
Abstract
Abstract A process for making a tape of filaments which comprises winding at least one bundle of filaments, for example carbon filaments, helically on a mandrel to produce a multilayer structure of filaments of even thickness, and helically cutting the filaments in the same sense as they are wound to produce a tape of filaments. Apparatus for performing the process is also described.
Inventors
- 👤 D Willats
- 👤 P Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:02
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/20; B29C53/00; B29C53/56; B29C53/58; B29C53/581; B29C53/582; B29K; B29K2307/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
A process for making a tape of carbon filaments comprising providing at least one bundle of carbon filaments, applying an inter-filament adhesive to the bundle of carbon filaments, winding the bundle of carbon filaments helically on a mandrel to produce a multi-layer structure of even thickness, and helically cutting the multi-layer structure parallel to the wound carbon filaments to produce a tape of carbon filaments.
Claim 2
Dependent Claim
65 words
A process for making a tape of carbon filaments comprising providing at least one bundle of carbon filaments, applying an inter-filament adhesive to the bundle of carbon filaments, winding the bundle of carbon filaments helically on a mandrel to produce a multi-layer structure of even thickness, and helically cutting the multi-layer structure parallel to the wound carbon filaments to produce a tape of carbon filaments.
Claim 3
Dependent Claim
42 words
A process according to claim 1 wherein the filaments are wound by winding a bundle of filaments at a pitch such that the filaments in each circuit of the mandrel by the bundle partly overlap the filaments in the immediately preceding circuit.
Claim 4
Dependent Claim
99 words
A process according to claim 1 wherein the filaments are wound by providing a first layer of filaments by winding a first bundle of filaments at a pitch such that there is no overlap between the filaments in each circuit of the mandrel by the bundle and the filaments in the immediately preceding circuit, and by providing one or more additional layers by winding one or more additional bundles of filaments at the same pitch as the first bundle, sy that the filaments of a particular layer overlap the filaments in the layer wound immediately preceding said particular layer.
Claim 5
Dependent Claim
17 words
A process according to claim 1 wherein the mandrel is continuously presented to the bundles of filaments.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |