Patent US4331898A successfully refreshed from Google Patents.
US2392033A
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Sucker rod coupling with zinc inserts
Assignee: Bethlehem Steel Corp
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Filing: 1941-11-01
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Granted: 1946-01-01
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Expires: 1961-11-01
Abstract
No abstract record available.
Inventors
- 👤 John F Eaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:19
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1071; C; C23; C23F; C23F13/00; C23F13/02; E21B41/00; E21B41/02; Y; Y10; Y10T; Y10T403/00; Y10T403/57; Y10T403/5733
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-12-31 | 1949-07-02 | 1950-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-12-31 | 1953-07-02 | 1954-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-12-31 | 1957-07-02 | 1958-01-01 | $7700.00 | Window Closed / Lapsed |