Patent US2619579A successfully refreshed from Google Patents.
US2619579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric air heater
Assignee: Foster Wheeler Inc
•
Filing: 1950-05-04
•
Granted: 1952-11-25
•
Expires: 1970-05-04
Abstract
No abstract record available.
Inventors
- 👤 John W Cartinhour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:07
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1356818A
Cited
US1615166A
Cited
US1727584A
Cited
US1787801A
Cited
US1985280A
Cited
US1926958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-25 | 1956-05-26 | 1956-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-25 | 1960-05-26 | 1960-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-25 | 1964-05-26 | 1964-11-25 | $7700.00 | Window Closed / Lapsed |