Patent US2657912A successfully refreshed from Google Patents.
US2657912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing support for vertical agitating shafts
Assignee: Dravo Corp
•
Filing: 1952-04-05
•
Granted: 1953-11-03
•
Expires: 1972-04-05
Abstract
No abstract record available.
Inventors
- 👤 Arno J Liebman
- 👤 Joseph W Dorsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:28
CPC Classifications
B; B01; B01F; B01F27/00; B01F27/05; B01F27/11; B01F27/112; B01F27/19; B01F27/191; B01F27/80; B01F27/90; B01F27/906; B01F35/00; B01F35/40; B01F35/41; B01F35/412; B01F35/4121; B01F35/30; B01F2035/35; B01F2035/352; B01F27/07; B01F27/072; B01F27/0723; B01F27/0724
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |