Patent US2399994A successfully refreshed from Google Patents.
US2013136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot air furnace
Assignee: Individual
•
Filing: 1931-06-03
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Granted: 1935-09-03
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Expires: 1951-06-03
Abstract
No abstract record available.
Inventors
- 👤 Frank H Cornelius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:18
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064; F24H9/2085; F24H15/00; F24H15/20; F24H15/30; F24H15/305; F24H15/31; F24H15/355; F24H15/36; F24H3/00; F24H3/02; F24H3/06; F24H3/065; Y; Y10; Y10S; Y10S116/00; Y10S116/42; Y10S55/00; Y10S55/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-09-02 | 1939-03-04 | 1939-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-09-02 | 1943-03-04 | 1943-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-09-02 | 1947-03-04 | 1947-09-03 | $7700.00 | Window Closed / Lapsed |