Patent US3825457A successfully refreshed from Google Patents.
US3825457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of mouldig hollow rubber articles
Assignee: Dunlop Ltd
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Filing: 1971-11-15
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Granted: 1974-07-23
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Expires: 1991-11-15
Abstract
Abstract A method for molding a hollow rubber article in which the article is formed as two separate halves of uncured rubber, the halves having locking sprues to prevent their displacement, the mould is pressurized with gas and the halves are then brought together and jointed and cured.
Inventors
- 👤 E Holroyd
- 👤 A Goodfellow
- 👤 Glashen J Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:58
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/02; B29K; B29K2021/00
Claims Analysis
Total Claims: 0
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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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |