Patent US2526464A successfully refreshed from Google Patents.
US2526464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot-air heater and boiler therefor
Assignee: Individual
•
Filing: 1947-03-14
•
Granted: 1950-10-17
•
Expires: 1967-03-14
Abstract
No abstract record available.
Inventors
- 👤 George W Folk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:37
CPC Classifications
F; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0008; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/08; F24H3/087
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US208822A
Cited
US391031A
Cited
US1781358A
Cited
US2190998A
Cited
US2249554A
Cited
US2269055A
Cited
US2387437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-16 | 1954-04-17 | 1954-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-16 | 1958-04-17 | 1958-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-16 | 1962-04-17 | 1962-10-17 | $7700.00 | Window Closed / Lapsed |