US2479587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heater
Assignee: Electro Therm Inc
•
Filing: 1944-09-30
•
Granted: 1949-08-23
•
Expires: 1964-09-30
Abstract
No abstract record available.
Inventors
- 👤 Morris Nathan
- 👤 Richard L Fearn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:27
CPC Classifications
H; H05; H05B; H05B1/00; H05B1/02; H05B1/0202; H05B1/0216; H05B3/00; H05B3/78; H05B3/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1662556A
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US1907869A
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US1930551A
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US1912921A
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US2039641A
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US2088728A
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US2163801A
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US2112137A
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US2258835A
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US2325377A
Cited
US2369932A
Cited
US2358732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-22 | 1953-02-21 | 1953-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-22 | 1957-02-21 | 1957-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-22 | 1961-02-21 | 1961-08-23 | $7700.00 | Window Closed / Lapsed |