US2590519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot-gas engine or refrigerator
Assignee: Hartford National Bank and Trust Co
•
Filing: 1948-01-21
•
Granted: 1952-03-25
•
Expires: 1968-01-21
Abstract
No abstract record available.
Inventors
- 👤 Pre Frits Karel Du
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:39
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G2243/00; F02G2243/30; F02G2243/34; F02G2244/00; F02G2244/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |