Patent US2744771A successfully refreshed from Google Patents.
US2744771A
Expired / Lapsed
US
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Pipe coupling ring with locking means
Assignee: FRANK A RUDMAN
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Filing: 1951-02-05
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Granted: 1956-05-08
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Expires: 1971-02-05
Abstract
No abstract record available.
Inventors
- 👤 Milton P Laurent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:37
CPC Classifications
F; F16; F16L; F16L37/00; F16L37/08; F16L37/12; F16L37/123; F16L23/00; F16L23/04
Claims Analysis
Total Claims: 0
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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) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |