US2705535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well heating method and apparatus
Assignee: Individual
•
Filing: 1950-06-24
•
Granted: 1955-04-05
•
Expires: 1970-06-24
Abstract
No abstract record available.
Inventors
- 👤 Russell R Waterman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:42
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US48994A
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US200393A
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US403183A
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US760304A
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US1012777A
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US1709581A
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US1714647A
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US1960999A
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US2049050A
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US2035381A
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US2094038A
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US2208784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-04 | 1958-10-04 | 1959-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-04 | 1962-10-04 | 1963-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-04 | 1966-10-04 | 1967-04-05 | $7700.00 | Window Closed / Lapsed |