US1756830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevated central header for gas lifts
Assignee: Union Oil Company of California
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Filing: 1927-07-18
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Granted: 1930-04-29
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Expires: 1947-07-18
Abstract
No abstract record available.
Inventors
- 👤 Harry C Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:58
CPC Classifications
F; F04; F04F; F04F1/00; F04F1/18; E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122; Y; Y10; Y10T; Y10T137/00; Y10T137/402; Y10T137/8593; Y10T137/87249; Y10T137/877; Y10T137/87877
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) | 1933-04-28 | 1933-10-28 | 1934-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-04-28 | 1937-10-28 | 1938-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-04-28 | 1941-10-28 | 1942-04-29 | $7700.00 | Window Closed / Lapsed |