Patent US2921650A successfully refreshed from Google Patents.
US2921650A
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Assignee: Dunlop Rubber Co Ltd
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Filing: 1954-09-14
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Granted: 1960-01-19
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Expires: 1974-09-14
Abstract
No abstract record available.
Inventors
- 👤 Butler Henry James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:23
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/02; F16D65/04; F16D65/092; B; B61; B61H; B61H5/00; F16D55/00; F16D55/02; F16D55/22; F16D55/228
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2174396A
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US2479085A
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US2496699A
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US2575578A
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US2657772A
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US2612968A
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US2682320A
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US2754936A
Cited
US2799367A
Cited
GB688382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |