US2827893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace system for heating air and water
Assignee: Individual
•
Filing: 1955-01-28
•
Granted: 1958-03-25
•
Expires: 1975-01-28
Abstract
No abstract record available.
Inventors
- 👤 Andrew A Ribaudo
- 👤 Noster Stanley
- 👤 Ralph P Clausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:39
CPC Classifications
F; F24; F24H; F24H6/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1452249A
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US1779714A
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US2029574A
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US2129202A
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US2096286A
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US2089367A
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US2130894A
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US2190998A
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US2476018A
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US2482746A
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US2533692A
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US2573364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |