US2660249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for heating oil wells
Assignee: Individual
•
Filing: 1949-11-18
•
Granted: 1953-11-24
•
Expires: 1969-11-18
Abstract
No abstract record available.
Inventors
- 👤 John J Jakosky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:51
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1327269A
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US1764213A
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US1970295A
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US1776997A
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US1973541A
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US2083799A
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US2233890A
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US2244256A
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US2472445A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |