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Patent US2506554A successfully refreshed from Google Patents.
US2506554A
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US
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Hinged heating unit
Assignee: Tuttle & Kift Inc
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Filing: 1944-12-06
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Granted: 1950-05-02
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Expires: 1964-12-06
Abstract
No abstract record available.
Inventors
- 👤 William R Tuttle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:00
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/10; F24C15/102; F24C15/104
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1268990A
Cited
US1359400A
Cited
US1823925A
Cited
US1998330A
Cited
US2271978A
Cited
US2368051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-01 | 1953-10-31 | 1954-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-01 | 1957-10-31 | 1958-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-01 | 1961-10-31 | 1962-05-02 | $7700.00 | Window Closed / Lapsed |