US3448798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer apparatus
Assignee: Wakefield Engineering Inc
•
Filing: 1968-01-26
•
Granted: 1969-06-10
•
Expires: 1988-01-26
Abstract
No abstract record available.
Inventors
- 👤 Thomas D Coe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:11
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA499568A
Cited
US2687626A
Cited
US2867417A
Cited
US2944138A
Cited
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) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |