US2256345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cooled drive for draft fans
Assignee: Marley Co LLC
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Filing: 1940-08-03
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Granted: 1941-09-16
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Expires: 1960-08-03
Abstract
No abstract record available.
Inventors
- 👤 Leon T Mart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:55
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/04; F04D29/043; F04D29/044; F04D25/00; F04D25/02; F04D29/05; F04D29/053; F04D29/054; F28; F28F; F28F25/00; F28F25/10; F16; F16D; F16D2300/00; F16D2300/02; F16D2300/021; F16D2300/0212; Y; Y10; Y10T; Y10T403/00; Y10T403/45; Y10T403/455; Y10T403/458
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) | 1944-09-15 | 1945-03-17 | 1945-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-15 | 1949-03-17 | 1949-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-15 | 1953-03-17 | 1953-09-16 | $7700.00 | Window Closed / Lapsed |