US1421937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric water heater
Assignee: ELECTRIC CONTROLLER Co IN
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Filing: 1921-07-28
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Granted: 1922-07-04
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Expires: 1941-07-28
Abstract
No abstract record available.
Inventors
- 👤 Arthur M Goldberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:48
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/105; H05B6/108
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) | 1925-07-03 | 1926-01-02 | 1926-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-07-03 | 1930-01-02 | 1930-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-07-03 | 1934-01-02 | 1934-07-04 | $7700.00 | Window Closed / Lapsed |