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US945321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil-well heater.
Assignee: Individual
•
Filing: 1909-04-02
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Granted: 1910-01-04
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Expires: 1929-04-02
Abstract
No abstract record available.
Inventors
- 👤 William E Gardner
- 👤 Gustave A Israelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:58
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) | 1913-01-03 | 1913-07-05 | 1914-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1917-01-03 | 1917-07-05 | 1918-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1921-01-03 | 1921-07-05 | 1922-01-04 | $7700.00 | Window Closed / Lapsed |