Patent US2719716A successfully refreshed from Google Patents.
US2719716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball impellers
Assignee: Individual
•
Filing: 1952-05-26
•
Granted: 1955-10-04
•
Expires: 1972-05-26
Abstract
No abstract record available.
Inventors
- 👤 Darwin L Sawtelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:05
CPC Classifications
A; A63; A63B; A63B65/00; A63B65/12; A63B65/122; A63F; A63F7/00; A63F7/22; A63F7/24; A63F7/2409; A63F7/2472; A63F2250/00; A63F2250/48; A63F2250/485; A63F2250/486; A63F2250/487; A63F2250/488
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US937078A
Cited
US1609247A
Cited
US2001449A
Cited
US2401195A
Cited
US2399711A
Cited
US2542777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-03 | 1959-04-04 | 1959-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-03 | 1963-04-04 | 1963-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-03 | 1967-04-04 | 1967-10-04 | $7700.00 | Window Closed / Lapsed |