US3870641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Horizontal belt filters
Assignee: D AND C Ltd
•
Filing: 1973-09-24
•
Granted: 1975-03-11
•
Expires: 1993-09-24
Abstract
Abstract A horizontal belt filter is described which comprises as a filtering medium, an endless belt of filter cloth having vacuum trays disposed beneath the upper horizontal reach. There being means to intermittently advance the belt, by a predetermined distance, said means comprising a moveable roller which is moveable by rams.
Inventors
- 👤 Henri Gerhard Willem Pierson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:36
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/09; B01D29/62; B01D29/64; B01D29/6438; B01D29/6453; B01D29/6469; B01D29/6484; B01D29/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A horizontal belt filter, comprising as a filtering medium, an endless belt of filter cloth arranged to have an upper horizontal reach, vacuum trays disposed beneath said upper horizontal reach, and means for feeding material to be filtered onto said upper horizontal reach, means for intermittently advancing the belt by a predetermined distance comprising a movable roller and rams which are extensible to move the roller outwardly, wherein the belt is driven through a roller which has a ratchet device to prevent pulling back of the belt on movement of the movable roller and including a tensioning roller which takes up a slack in the belt which is pulled out on movement of the movable roller.
Claim 2
Dependent Claim
116 words
A horizontal belt filter, comprising as a filtering medium, an endless belt of filter cloth arranged to have an upper horizontal reach, vacuum trays disposed beneath said upper horizontal reach, and means for feeding material to be filtered onto said upper horizontal reach, means for intermittently advancing the belt by a predetermined distance comprising a movable roller and rams which are extensible to move the roller outwardly, wherein the belt is driven through a roller which has a ratchet device to prevent pulling back of the belt on movement of the movable roller and including a tensioning roller which takes up a slack in the belt which is pulled out on movement of the movable roller.
References Cited (Backward Citations)
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US3342123A
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US3335862A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |