US1291302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for stimulating the production of oil.
Assignee: OIL WELL HEATING Co
•
Filing: 1918-03-18
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Granted: 1919-01-14
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Expires: 1938-03-18
Abstract
No abstract record available.
Inventors
- 👤 Fred B Waring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:54
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) | 1922-01-13 | 1922-07-15 | 1923-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1926-01-13 | 1926-07-15 | 1927-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1930-01-13 | 1930-07-15 | 1931-01-14 | $7700.00 | Window Closed / Lapsed |