US2661409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic electric water heater
Assignee: Individual
•
Filing: 1951-02-21
•
Granted: 1953-12-01
•
Expires: 1971-02-21
Abstract
No abstract record available.
Inventors
- 👤 Lorenzetti Lorenzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:37
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/10; F24H1/101; F24H1/102; F24H1/103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1569485A
Cited
US997670A
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US1340668A
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US1554502A
Cited
US1557682A
Cited
US1645278A
Cited
US1670767A
Cited
US1825793A
Cited
US2036117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |