US4085050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous filter with continuous cake removal
Assignee: Individual
•
Filing: 1976-06-21
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Granted: 1978-04-18
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Expires: 1996-06-21
Abstract
Abstract Filter unit comprises scraper means provided spaced apart from the rigid perforated arresting wall, on which a filtering member, such as a cloth, is supported, in order to maintain at a predetermined value the thickness of the filter bed consisting of the turbid particles.
Inventors
- 👤 Enzo Gervasi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:38
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/25; B01D29/50; B01D29/52; B01D29/62; B01D29/64; B01D29/6469; B01D29/6476; B01D29/76; B01D29/78; B01D29/88; B01D29/90; B01D29/92
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
Filter unit comprising in combination: an outer cylindrical casing, at least one perforate inner cylindrical casing encircled by and spaced inwardly from said outer casing, filter means carried on the inner surface of said inner casing, a shaft positioned axially of said inner casing and mounted to rotate therewithin, helical scraper means projecting radially from said shaft and attached thereto by means permitting adjustment of the distance between said scraper means and filter means, said scraper means terminating just short of said filter means, inlet means for introducing a fluid to be filtered between said shaft and inner casing, first outlet means for withdrawing filtered liquid from between said casings, and second outlet means for withdrawing from within said inner casing material which has been scraped from said filter by said scraper.
Claim 2
Dependent Claim
132 words
Filter unit comprising in combination: an outer cylindrical casing, at least one perforate inner cylindrical casing encircled by and spaced inwardly from said outer casing, filter means carried on the inner surface of said inner casing, a shaft positioned axially of said inner casing and mounted to rotate therewithin, helical scraper means projecting radially from said shaft and attached thereto by means permitting adjustment of the distance between said scraper means and filter means, said scraper means terminating just short of said filter means, inlet means for introducing a fluid to be filtered between said shaft and inner casing, first outlet means for withdrawing filtered liquid from between said casings, and second outlet means for withdrawing from within said inner casing material which has been scraped from said filter by said scraper.
Claim 3
Dependent Claim
33 words
Filter unit as claimed in claim 1 in which said shaft is hollow and perforate, said unit comprising means for introducing liquid under pressure into said shaft for expulsion through the perforations therein.
Claim 4
Dependent Claim
45 words
Filter unit as claimed in claim 1 in which the axis of said inner casing is vertical, and said inner casing terminates at its lower end in an at least partially conical sump, said second outlet means being located at the bottom of said sump.
Claim 5
Dependent Claim
18 words
Filter unit as claimed in claim 1 comprising a plurality of inner casings within a single outer casing.
Claim 6
Dependent Claim
67 words
Filter unit as claimed in claim 1 in which said scraper means is fixed to said shaft at one end, and said means permitting adjustment of the distance between said scraper means and said filter means comprises, an annular member attached to the other end of said scraper means and mounted to be rotated about said shaft to thereby change the outer diameter of said scraper means.
Claim 7
Dependent Claim
27 words
Filter unit as claimed in claim 5 in which said shaft is coupled to a motor connected to rotate said scraper means continuously throughout a filtration cycle.
Claim 8
Dependent Claim
23 words
Filter unit as claimed in Claim 5 further comprising means for fixing said annular member to said shaft for rotation with the shaft.
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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |