Patent US3011220A successfully refreshed from Google Patents.
US3011220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for separating mixtures of coarse and fine materials
Assignee: Louisiana State University
•
Filing: 1958-05-13
•
Granted: 1961-12-05
•
Expires: 1978-05-13
Abstract
No abstract record available.
Inventors
- 👤 Arthur G Keller
- 👤 Walter J Zimmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:17
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/02; D21D5/023; B; B02; B02C; B02C13/00; B02C13/02; B02C13/04; B02C13/10; B02C13/26; B02C13/28; B02C13/282; B02C13/284; D21B; D21B1/00; D21B1/02; D21B1/025; D21D1/00; D21D1/20; D21D1/32; D21D5/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US400953A
Cited
US1459938A
Cited
US2729856A
Cited
US2729858A
Cited
US2825935A
Cited
US2785865A
Cited
US2812552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-04 | 1965-06-05 | 1965-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-04 | 1969-06-05 | 1969-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-04 | 1973-06-05 | 1973-12-05 | $7700.00 | Window Closed / Lapsed |