US2665840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan with adjustable inlet for secondary air
Assignee: Combustion Engineering Inc
•
Filing: 1949-09-01
•
Granted: 1954-01-12
•
Expires: 1969-09-01
Abstract
No abstract record available.
Inventors
- 👤 Elno M Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:28
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/08; F; F04; F04D; F04D27/00; F04D27/009; Y; Y10; Y10S; Y10S165/00; Y10S165/921
Claims Analysis
Total Claims: 0
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US2476543A
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US2499358A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |