US2799267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forced downflow hot air heater
Assignee: E A RADKE
•
Filing: 1954-11-10
•
Granted: 1957-07-16
•
Expires: 1974-11-10
Abstract
No abstract record available.
Inventors
- 👤 Siggelkow Evan Culver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:00
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/08; F24H3/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US340826A
Cited
GB108500A
Cited
GB141300A
Cited
US1416255A
Cited
US2410547A
Cited
US2532089A
Cited
US2593759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-15 | 1961-01-14 | 1961-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-15 | 1965-01-14 | 1965-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-15 | 1969-01-14 | 1969-07-16 | $7700.00 | Window Closed / Lapsed |