Patent US2680429A successfully refreshed from Google Patents.
US2680429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical indirect water heater
Assignee: SELLERS ENGINEERING Co
•
Filing: 1950-06-23
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Granted: 1954-06-08
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Expires: 1970-06-23
Abstract
No abstract record available.
Inventors
- 👤 Ove M Olsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:49
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/08; F24D3/087; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/49943
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1742329A
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US1934496A
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US1959286A
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US1951403A
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US2003742A
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US1971139A
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US2047864A
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US2151108A
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US2201406A
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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) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |