US2504491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system with mixing valve
Assignee: Individual
•
Filing: 1946-03-20
•
Granted: 1950-04-18
•
Expires: 1966-03-20
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Broderick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:46
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/08; F24D3/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US778332A
Cited
US1355832A
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US1972842A
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US2073677A
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US2204708A
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US2211573A
Cited
US2345209A
Cited
US2404596A
Cited
US2404597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |