Patent US2681708A successfully refreshed from Google Patents.
US2681708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan construction
Assignee: Individual
•
Filing: 1950-09-01
•
Granted: 1954-06-22
•
Expires: 1970-09-01
Abstract
No abstract record available.
Inventors
- 👤 Gail E Mix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:52
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1806539A
Cited
FR419867A
Cited
US1121335A
Cited
US1201866A
Cited
US1382559A
Cited
US1818607A
Cited
US2133144A
Cited
US2251888A
Cited
US2107136A
Cited
US2140017A
Cited
US2317502A
Cited
US2460902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-21 | 1957-12-21 | 1958-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-21 | 1961-12-21 | 1962-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-21 | 1965-12-21 | 1966-06-22 | $7700.00 | Window Closed / Lapsed |