US2491266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric water heater
Assignee: JOHN WOOD MANUFACTURING COMPANY Inc
•
Filing: 1948-05-07
•
Granted: 1949-12-13
•
Expires: 1968-05-07
Abstract
No abstract record available.
Inventors
- 👤 Clifford F T Hooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:22
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/18; F24H9/1809; F24H9/1818
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1321462A
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DE381906C
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US1244817A
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CH75859A
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CH82021A
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DE392014C
Cited
US1645230A
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CH208911A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |