Patent US3527049A successfully refreshed from Google Patents.
US3527049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound stirling cycle engines
Assignee: Individual
•
Filing: 1967-11-03
•
Granted: 1970-09-08
•
Expires: 1987-11-03
Abstract
No abstract record available.
Inventors
- 👤 Vannevar Bush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:43
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/044; F02G1/045; F02G1/05; F02G2244/00; F02G2244/50
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
NL63822C
Cited
US2480525A
Cited
US2616245A
Cited
US2643507A
Cited
US2664699A
Cited
US2794315A
Cited
US3312072A
Cited
US3372539A
Cited
US3397533A
Cited
US3379026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-07 | 1974-03-09 | 1974-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-07 | 1978-03-09 | 1978-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-07 | 1982-03-09 | 1982-09-08 | $7700.00 | Window Closed / Lapsed |