Patent EP0161491A1 successfully refreshed from Google Patents.
US2657528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot gas engine enclosing two thermodynamic cycles
Assignee: Hartford National Bank and Trust Co
•
Filing: 1949-11-29
•
Granted: 1953-11-03
•
Expires: 1969-11-29
Abstract
No abstract record available.
Inventors
- 👤 Jonkers Cornelius Otto
- 👤 Kohler Jacob Willem Laurens
- 👤 Liebe August Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:10
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/044
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US228716A
Cited
US334153A
Cited
US374123A
Cited
US2067453A
Cited
US2272925A
Cited
US2480525A
Cited
US2484392A
Cited
US2564363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |