US839255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit-opening device for electric heaters.
Assignee: Simplex Electric Heating Co
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Filing: 1905-05-05
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Granted: 1906-12-25
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Expires: 1925-05-05
Abstract
No abstract record available.
Inventors
- 👤 James I Ayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:40
CPC Classifications
H; H05; H05B; H05B1/00; H05B1/02; H05B1/0202; H05B1/0205
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) | 1909-12-24 | 1910-06-25 | 1910-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1913-12-24 | 1914-06-25 | 1914-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1917-12-24 | 1918-06-25 | 1918-12-25 | $7700.00 | Window Closed / Lapsed |