US2621849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial flow fan with yieldingly centered fan element
Assignee: Joy Manufacturing Co
•
Filing: 1949-05-25
•
Granted: 1952-12-16
•
Expires: 1969-05-25
Abstract
No abstract record available.
Inventors
- 👤 Harold F Minnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:19
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/60; F04D29/64; F04D29/644; F04D29/646
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB348446A
Cited
US1867365A
Cited
US1927644A
Cited
US2141648A
Cited
US2100439A
Cited
US2257804A
Cited
US2264895A
Cited
US2316389A
Cited
US2294586A
Cited
US2339565A
Cited
US2397171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |