Patent US1436657A successfully refreshed from Google Patents.
US1436657A
Expired / Lapsed
US
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Electrical heating device
Assignee: Individual
•
Filing: 1921-11-26
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Granted: 1922-11-28
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Expires: 1941-11-26
Abstract
No abstract record available.
Inventors
- 👤 Clarence B Ingersoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:53
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/10; F24C15/102; F24C15/106
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) | 1925-11-27 | 1926-05-29 | 1926-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-11-27 | 1930-05-29 | 1930-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-11-27 | 1934-05-29 | 1934-11-28 | $7700.00 | Window Closed / Lapsed |