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Patent US1935247A successfully refreshed from Google Patents.
US1935247A
Expired / Lapsed
US
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Instantaneous electric water heater with automatic switch
Assignee: Individual
•
Filing: 1932-05-17
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Granted: 1933-11-14
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Expires: 1952-05-17
Abstract
No abstract record available.
Inventors
- 👤 Ludwig Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:00
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)
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) | 1936-11-13 | 1937-05-15 | 1937-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-11-13 | 1941-05-15 | 1941-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-11-13 | 1945-05-15 | 1945-11-14 | $7700.00 | Window Closed / Lapsed |