Patent US2515365A successfully refreshed from Google Patents.
US2515365A
Expired / Lapsed
US
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Flexible drill pipe
Assignee: CASPER LEONID ZUBLIN
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Filing: 1947-03-31
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Granted: 1950-07-18
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Expires: 1967-03-31
Abstract
No abstract record available.
Inventors
- 👤 John A Zublin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:52
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/22; E21B17/02; E21B17/04; E21B17/046; E21B17/20; E21B7/00; E21B7/04; E21B7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1314601A
Cited
US556819A
Cited
US578801A
Cited
US369865A
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US218744A
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US829977A
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US861659A
Cited
GB266750A
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US1943035A
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US1930191A
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US2336338A
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US2296161A
Cited
US2362817A
Cited
US2354485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |