US2800069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Warm air heating device
Assignee: Individual
•
Filing: 1954-02-10
•
Granted: 1957-07-23
•
Expires: 1974-02-10
Abstract
No abstract record available.
Inventors
- 👤 Melvin P Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:26
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/072
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2027097A
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FR853964A
Cited
US2516871A
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US2483704A
Cited
US2585703A
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US2627800A
Cited
US2639655A
Cited
US2662747A
Cited
US2741970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |