US2952445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damage resistant plate type heat exchanger
Assignee: United Aircraft Products Inc
•
Filing: 1958-06-25
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Granted: 1960-09-13
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Expires: 1978-06-25
Abstract
No abstract record available.
Inventors
- 👤 Edward L Ladd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:31
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0062; F28F; F28F3/00; F28F3/02; F28F3/025; F28F2215/00; F28F2215/04; F28F2265/00; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/387; Y10S165/39
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |