Patent US4066818A successfully refreshed from Google Patents.
US2811337A
Expired / Lapsed
US
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Heat exchanger
Assignee: Garrett Corp
•
Filing: 1951-07-20
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Granted: 1957-10-29
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Expires: 1971-07-20
Abstract
No abstract record available.
Inventors
- 👤 Soren K Andersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:14
CPC Classifications
F; F01; F01P; F01P11/00; F01P11/08; F28; F28D; F28D21/00; F28D2021/0019; F28D2021/008; F28D2021/0089
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |