Patent US3633881A successfully refreshed from Google Patents.
US1012777A
Expired / Lapsed
US
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Heating apparatus for oil-wells.
Assignee: Individual
•
Filing: 1911-01-31
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Granted: 1911-12-26
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Expires: 1931-01-31
Abstract
No abstract record available.
Inventors
- 👤 Wilson B Wigle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:07
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/005
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) | 1914-12-25 | 1915-06-26 | 1915-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1918-12-25 | 1919-06-26 | 1919-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1922-12-25 | 1923-06-26 | 1923-12-26 | $7700.00 | Window Closed / Lapsed |