US2684431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heater
Assignee: Edwin L Wiegand Co
•
Filing: 1951-09-05
•
Granted: 1954-07-20
•
Expires: 1971-09-05
Abstract
No abstract record available.
Inventors
- 👤 Harry C Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:32
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68; H05B3/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1127374A
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US1506744A
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US2158004A
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US2320041A
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US2414667A
Cited
US2503559A
Cited
US2565443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-19 | 1958-01-18 | 1958-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-19 | 1962-01-18 | 1962-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-19 | 1966-01-18 | 1966-07-20 | $7700.00 | Window Closed / Lapsed |