Patent US2921801A successfully refreshed from Google Patents.
US2921801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible pipe coupling
Assignee: Individual
•
Filing: 1955-03-21
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Granted: 1960-01-19
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Expires: 1975-03-21
Abstract
No abstract record available.
Inventors
- 👤 Walter O Beyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:48
CPC Classifications
F; F16; F16L; F16L17/00; F16L17/02; F16L17/03; F16L17/035; F16L37/00; F16L37/008; F16L37/08; F16L37/084; F16L37/092; F16L41/00; F16L41/08; F16L41/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2087916A
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US2184376A
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US2449735A
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US2534723A
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US2709092A
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US2818082A
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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 |