Patent US3429122A successfully refreshed from Google Patents.
US3429122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pipe regenerator for gas turbine engines
Assignee: Lockheed Martin Corp
•
Filing: 1966-11-07
•
Granted: 1969-02-25
•
Expires: 1986-11-07
Abstract
No abstract record available.
Inventors
- 👤 Milton F Pravda
- 👤 William J Levedahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:48
CPC Classifications
F; F28; F28D; F28D15/00; F28D15/02; F28D15/0233; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/181; F02; F02C; F02C7/00; F02C7/08; F02C7/10; F05; F05D; F05D2260/00; F05D2260/20; F05D2260/208; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1725906A
Cited
US2529915A
Cited
US2516910A
Cited
US2704439A
Cited
US3287906A
Cited
US3355883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |