Patent US2446879A successfully refreshed from Google Patents.
US2446879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air flow control
Assignee: Schneider Electric Buildings Americas Inc
•
Filing: 1943-06-28
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Granted: 1948-08-10
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Expires: 1963-06-28
Abstract
No abstract record available.
Inventors
- 👤 Walter W Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:12
CPC Classifications
F; F41; F41H; F41H7/00; F41H7/02; F41H7/03
Claims Analysis
Total Claims: 0
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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) | 1951-08-10 | 1952-02-09 | 1952-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-10 | 1956-02-09 | 1956-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-10 | 1960-02-09 | 1960-08-10 | $7700.00 | Window Closed / Lapsed |