US3473210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a heat exchanger
Assignee: United Aircraft Products Inc
•
Filing: 1967-01-19
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Granted: 1969-10-21
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Expires: 1987-01-19
Abstract
No abstract record available.
Inventors
- 👤 Walter C Klank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:54
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; F; F28; F28D; F28D1/00; F28D1/02; F28D1/03; F28D1/0308; F28D1/0325; F28D1/0333; F28F; F28F3/00; F28F3/02; F28F3/025; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366; Y10T29/53; Y10T29/53113; Y10T29/53961
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2222721A
Cited
US2617634A
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US2952444A
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US3212572A
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US3240268A
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US3263314A
Cited
US3345726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |