US3769121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retreading of tires
Assignee: Republic Rubber Ind Ltd
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Filing: 1971-04-26
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Granted: 1973-10-30
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Expires: 1991-04-26
Abstract
Abstract The invention provides for a method of and means for the retreading of tires. In accordance with the invention a tire is retreaded by enclosing it in a flexible envelope, sealing the envelope, establishing a higher pressure outside the envelope to force the envelope against the new tread and thereby to force the new tread against the tire casing, and raising the ambient temperature outside the envelope.
Inventors
- 👤 A Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:21
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/52; B29D30/54; B29D30/542; B29D30/56; B29D2030/545; Y; Y10; Y10S; Y10S156/00; Y10S156/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A method of retreading tires including locating a precured tread of the tread zone of a tire casing with an uncured bonding material interposed between the tread and the tire casing, enclosing the tread and the tread zone in a flexible enVelope, rapidly establishing a super-atmospheric fluid pressure at ambient temperature below curing temperature outside the envelope thus avoiding precuring of said bonding material, exhausting air from the space between the envelope and the tire casing by applying suction and forcing the envelope against the tread and the tread against the tire casing, after establishing the superatmospheric pressure outside the envelope, raising the ambient temperature outside the envelope to the curing temperature of the bonding material by the injection of steam, and maintaining the super-atmospheric pressure and the raised temperature until the bonding material is cured and bonds the tread to the tire casing.
Claim 2
Independent Claim
144 words
A method of retreading tires including locating a precured tread of the tread zone of a tire casing with an uncured bonding material interposed between the tread and the tire casing, enclosing the tread and the tread zone in a flexible enVelope, rapidly establishing a super-atmospheric fluid pressure at ambient temperature below curing temperature outside the envelope thus avoiding precuring of said bonding material, exhausting air from the space between the envelope and the tire casing by applying suction and forcing the envelope against the tread and the tread against the tire casing, after establishing the superatmospheric pressure outside the envelope, raising the ambient temperature outside the envelope to the curing temperature of the bonding material by the injection of steam, and maintaining the super-atmospheric pressure and the raised temperature until the bonding material is cured and bonds the tread to the tire casing.
References Cited (Backward Citations)
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Cited
US2292286A
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GB746375A
Cited
US2966936A
Cited
US2976910A
Cited
US3236709A
Cited
US3325326A
Cited
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 |