US3438432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic heat exchanger with anti-buoyancy means
Assignee: Boeing North American Inc
•
Filing: 1967-06-26
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Granted: 1969-04-15
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Expires: 1987-06-26
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Wetch
- 👤 Louis Bernath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:29
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/0206; F28D1/0213; C; C02; C02F; C02F1/00; C02F1/02; C02F1/04; C02F1/043; F28D7/00; F28D7/0041; F28F; F28F21/00; F28F21/06; F28F21/062; F28F9/00; F28F9/02; F28F9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2779573A
Cited
FR1075477A
Cited
FR1252631A
Cited
US3233662A
Cited
US3239000A
Cited
US3228456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |