US2813701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-flow heat exchanger
Assignee: RTX Corp
•
Filing: 1954-09-02
•
Granted: 1957-11-19
•
Expires: 1974-09-02
Abstract
No abstract record available.
Inventors
- 👤 Fenger Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:40
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0062; F28D9/0068; F28F; F28F2210/00; F28F2210/02; F28F2250/00; F28F2250/10; F28F2250/104
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2617634A
Cited
US2591878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |