US2784548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot air engines
Assignee: Individual
•
Filing: 1955-08-11
•
Granted: 1957-03-12
•
Expires: 1975-08-11
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Fiala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:14
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/34; F02G; F02G1/00; F02G1/04; F02G1/043; F02G2243/00; F02G2243/30; F02G2270/00; F02G2270/85
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US843398A
Cited
US1108182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |