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Patent US3508607A successfully refreshed from Google Patents.
US3508607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: MTU Aero Engines AG
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Filing: 1968-04-16
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Granted: 1970-04-28
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Expires: 1988-04-16
Abstract
No abstract record available.
Inventors
- 👤 Bruno Herrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:02
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/02; F28F3/04; F28F3/042; F28F3/046; F28D; F28D9/00; F28D9/0025; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/399
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) | 1973-04-27 | 1973-10-27 | 1974-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-27 | 1977-10-27 | 1978-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-27 | 1981-10-27 | 1982-04-28 | $7700.00 | Window Closed / Lapsed |