Patent US2497184A successfully refreshed from Google Patents.
US2497184A
Expired / Lapsed
US
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Electric hot-water tank attachment
Assignee: Individual
•
Filing: 1947-03-25
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Granted: 1950-02-14
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Expires: 1967-03-25
Abstract
No abstract record available.
Inventors
- 👤 Don C O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:09
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H6/00; F24H2230/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |