US3387653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer apparatus
Assignee: Wakefield Engineering Inc
•
Filing: 1967-01-26
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Granted: 1968-06-11
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Expires: 1987-01-26
Abstract
No abstract record available.
Inventors
- 👤 Thomas D Coe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:45
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F2255/00; F28F2255/16; F28F2275/00; F28F2275/12; F28F2275/122; F28F2275/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1313730A
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US2158324A
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US2867417A
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DE1061805B
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US2944138A
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DE1123647B
Cited
US2987300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |