US2764938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open hole carrier
Assignee: Borg Warner Corp
•
Filing: 1949-09-17
•
Granted: 1956-10-02
•
Expires: 1969-09-17
Abstract
No abstract record available.
Inventors
- 👤 Harcus Robert Traill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:55
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/117
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1318772A
Cited
GB414959A
Cited
US2366374A
Cited
US2402153A
Cited
US2494256A
Cited
US2543814A
Cited
US2649046A
Cited
US2686472A
Cited
US2680406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |