US2512384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-fired hot-air heating apparatus
Assignee: Dravo Corp
•
Filing: 1945-09-04
•
Granted: 1950-06-20
•
Expires: 1965-09-04
Abstract
No abstract record available.
Inventors
- 👤 Ralph M Rush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:40
CPC Classifications
F; 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)
US96328A
Cited
US1440465A
Cited
US1644180A
Cited
US1707531A
Cited
US1737732A
Cited
FR730002A
Cited
US2021605A
Cited
US2136235A
Cited
US2376140A
Cited
US2410547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-19 | 1953-12-19 | 1954-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-19 | 1957-12-19 | 1958-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-19 | 1961-12-19 | 1962-06-20 | $7700.00 | Window Closed / Lapsed |