US2862434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilation system
Assignee: Individual
•
Filing: 1954-01-04
•
Granted: 1958-12-02
•
Expires: 1974-01-04
Abstract
No abstract record available.
Inventors
- 👤 Samuel H Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:58
CPC Classifications
F; F24; F24F; F24F12/00; Y; Y10; Y10S; Y10S165/00; Y10S165/909
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1538686A
Cited
US2011117A
Cited
US1994515A
Cited
US2184484A
Cited
US2281002A
Cited
US2732027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |