US2806676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer apparatus
Assignee: Individual
•
Filing: 1951-06-13
•
Granted: 1957-09-17
•
Expires: 1971-06-13
Abstract
No abstract record available.
Inventors
- 👤 Frenkel Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:42
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/02; F28F3/00; F28F3/02; F28F3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US646378A
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US911829A
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US1015831A
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AT57298B
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US1399236A
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US1849874A
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GB345279A
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US2196707A
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US2281754A
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US2361691A
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US2239685A
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US2488615A
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GB634751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |