Patent US4040795A successfully refreshed from Google Patents.
Patent US2432289A successfully refreshed from Google Patents.
US2432289A
Expired / Lapsed
US
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Ventilating system
Assignee: Individual
•
Filing: 1943-09-08
•
Granted: 1947-12-09
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Expires: 1963-09-08
Abstract
No abstract record available.
Inventors
- 👤 George S Dauphinee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:18
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/062; F24F7/00; F24F7/007; F24F7/04; F24F7/06
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) | 1950-12-08 | 1951-06-09 | 1951-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-08 | 1955-06-09 | 1955-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-08 | 1959-06-09 | 1959-12-09 | $7700.00 | Window Closed / Lapsed |