US3615987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing annular seamless rubber or rubberlike components for use in the manufacture of pneumatic tires
Assignee: Dunlop Holdings Ltd
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Filing: 1968-06-20
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Granted: 1971-10-26
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Expires: 1988-06-20
Abstract
Abstract A method of manufacturing an annular seamless component of rubber or plastics material for use in for example pneumatic tires comprising extruding a tube of said material, cutting the extruded tube in the length, and positioning the said lengths onto a building former of which the following is a specification.
Inventors
- 👤 Karl Blatz
- 👤 Otto Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:15
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/08; B29D30/20; B60; B60C; B60C9/00; B60C9/02; B60C9/04; B29C; B29C2793/00; B29C2793/0081; B29C48/00; B29C48/03; B29C48/09; B29D2030/088
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
20 words
A method according to claim 1 wherein the tube is twisted after emergence from the extrusion head and before cutting.
Claim 2
Dependent Claim
19 words
A method according to claim 1 wherein the tube lengths are twisted after the extruded tube has been cut.
Claim 3
Dependent Claim
28 words
A method according to claim 1 wherein a plurality of layers of rubbery material, each of different composition is extruded to form a composite tube comprising concentric layers.
Claim 4
Dependent Claim
27 words
A method according to claim 1 wherein a carcass reinforcement for a pneumatic tire is manufactured as an annular seamless component and positioned on a tire-building former.
Claim 5
Dependent Claim
27 words
A method according to claim 1 wherein a sidewall component for a pneumatic tire is manufactured as an annular seamless component and positioned on a tire-building former.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |