US2580663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable-width window fan assembly
Assignee: Individual
•
Filing: 1949-12-16
•
Granted: 1952-01-01
•
Expires: 1969-12-16
Abstract
No abstract record available.
Inventors
- 👤 George A Delf
- 👤 Glenn A Delf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:15
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/007; F24F7/013; F04; F04D; F04D29/00; F04D29/60; F04D29/64; F04D29/644; F04D29/646
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1702117A
Cited
US879119A
Cited
US1241660A
Cited
US1707114A
Cited
US1793035A
Cited
US2350113A
Cited
US2448671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |