US3259244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen with open conduit feed
Assignee: Dorr Oliver Inc
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Filing: 1963-01-31
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Granted: 1966-07-05
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Expires: 1983-01-31
Abstract
No abstract record available.
Inventors
- 👤 Kaljo Gvido
- 👤 Paul L Stavenger
- 👤 James C Elsken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:43
CPC Classifications
B; B07; B07B; B07B1/00; B01; B01D; B01D35/00; B01D35/28; B07B2230/00; B07B2230/01
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
101 words
APPARATUS FOR SEPARATING PARTICLES ACCORDING TO SIZE COMPRISING: A CONCAVE BAR SCREEN HAVING A FEED END AND A DISCHARGE END, EACH BAR IN SAID SCREEN BEING SPACED A PREDETERMINED DISTANCE FROM THE NEXT ADJACENT BARS IN SAID SCREEN, AN OPEN FEED BOX SAID SCREEN FEED END, A WEIR IN FLOW COMMUNICATION WITH SAID FEED BOX HAVING A SUBSTANTIALLY FREE-FALL PARABOLIC SHAPE AND BEING TANGENT TO SAID SCREEN FEED END, MEANS SECURING SAID SCREEN FEED END SUBSTANTIALLY FLUSH WITH SAID WEIR TO PROVIDE A CONTINUOUS SURFACE FOR THE FLOW OF FEED MATERIAL FROM SAID WEIR ONTO SAID SCREEN, SAID SCREEN CURVING OUT-
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |