US3101116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bottom hole jet heater
Assignee: ELECTRONIC OIL WELL HEATER Inc
•
Filing: 1961-04-04
•
Granted: 1963-08-20
•
Expires: 1981-04-04
Abstract
No abstract record available.
Inventors
- 👤 Spitz Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:34
CPC Classifications
E; E21; E21B; E21B37/00; E21B36/00; E21B36/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1835355A
Cited
US2136881A
Cited
US2202034A
Cited
US2472445A
Cited
US2548360A
Cited
US2703621A
Cited
US2738409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-19 | 1967-02-18 | 1967-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-19 | 1971-02-18 | 1971-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-19 | 1975-02-18 | 1975-08-20 | $7700.00 | Window Closed / Lapsed |