US2496540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system
Assignee: Individual
•
Filing: 1942-12-07
•
Granted: 1950-02-07
•
Expires: 1962-12-07
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Holmes
- 👤 Gifford I Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:45
CPC Classifications
F; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0007; F24; F24D; F24D12/00; F24D12/02; F24D19/00; F24D19/10; F24D19/1006; F24D2200/00; F24D2200/04; F24D2200/16; F24D2200/18; Y; Y02; Y02B; Y02B10/00; Y02B10/70; Y02B30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1413924A
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US1440810A
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US1670955A
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US1716921A
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US1877223A
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US1838466A
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US1965078A
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US2062605A
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US2070536A
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US2070987A
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US2102324A
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US2162394A
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US2166355A
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US2365791A
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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) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |