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US2764428A
Expired / Lapsed
US
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Wash pipe mounting for swivels
Assignee: National Supply Co
•
Filing: 1951-01-26
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Granted: 1956-09-25
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Expires: 1971-01-26
Abstract
No abstract record available.
Inventors
- 👤 Demery A Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:42
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1512627A
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US1788500A
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US2031337A
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US2053626A
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US2380681A
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US2447712A
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US2496569A
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US2472061A
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US2558990A
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US2510414A
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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) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |