US2449531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impeller
Assignee: Individual
•
Filing: 1942-06-02
•
Granted: 1948-09-14
•
Expires: 1962-06-02
Abstract
No abstract record available.
Inventors
- 👤 Lee Nixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:25
CPC Classifications
B; B64; B64C; B64C11/00; F; F04; F04D; F04D19/00; F04D29/00; F04D29/26; F04D29/32; F04D29/325; F04D29/326
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US94463A
Cited
US1010443A
Cited
GB210630A
Cited
US1667987A
Cited
US1904746A
Cited
US1830985A
Cited
US1966461A
Cited
US2106928A
Cited
US2270615A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-14 | 1952-03-15 | 1952-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-14 | 1956-03-15 | 1956-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-14 | 1960-03-15 | 1960-09-14 | $7700.00 | Window Closed / Lapsed |