US1504208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heater for oil wells
Assignee: OIL WELLS RENEWAL Co
•
Filing: 1922-09-05
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Granted: 1924-08-12
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Expires: 1942-09-05
Abstract
No abstract record available.
Inventors
- 👤 Percival F Brine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:21
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/04
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) | 1927-08-12 | 1928-02-11 | 1928-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-08-12 | 1932-02-11 | 1932-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-08-12 | 1936-02-11 | 1936-08-12 | $7700.00 | Window Closed / Lapsed |