Patent US2684667A successfully refreshed from Google Patents.
US2684667A
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US
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Forced air flow warm air heating furnace
Assignee: J P GLASBY Manufacturing CO Inc
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Filing: 1948-06-26
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Granted: 1954-07-27
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Expires: 1968-06-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Jonathan P Glasby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:52
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |