Patent US4486307A successfully refreshed from Google Patents.
US4486307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter apparatus having filter bed back-washing means
Assignee: Aqseptence Group GmbH
•
Filing: 1982-09-13
•
Granted: 1984-12-04
•
Expires: 2002-09-13
Abstract
Abstract Filter apparatus embodying a filter bed back-washing unit comprising a raisable and lowerable suction bell, the side walls of which define division walls to compart the respective partial volume of the filter bed to be cleaned. The side walls of the suction bell are of a height at least equal to the height of the filter bed, and the suction bell is raisable and lowerable by a stroke length which corresponds at least approximately to this height.
Inventors
- 👤 Walter Weiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:28
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/02; B01D24/20; B01D24/22; B01D24/46; B01D24/4631; B01D24/4636
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
The combination with filter apparatus embodying a basin connected to a crude water intake and having a liquid permeable bottom lying above a filtrate chamber and supporting a filter bed, the improvement in a back washing unit for the filter bed comprising: a raisable and lowerable suction bell connected to a suction unit, means for transporting said suction bell horizontally through the basin in a raised position above the filter bed, means for lowering said suction bell into an operable position within the filter bed to back-wash a partial volume of the filter bed by the suction action of said suction unit withdrawing filtrate from the filtrate chamber with the side walls of said suction bell defining division walls to compart the respective partial volume of the filter bed to be cleaned.
Claim 2
Dependent Claim
132 words
The combination with filter apparatus embodying a basin connected to a crude water intake and having a liquid permeable bottom lying above a filtrate chamber and supporting a filter bed, the improvement in a back washing unit for the filter bed comprising: a raisable and lowerable suction bell connected to a suction unit, means for transporting said suction bell horizontally through the basin in a raised position above the filter bed, means for lowering said suction bell into an operable position within the filter bed to back-wash a partial volume of the filter bed by the suction action of said suction unit withdrawing filtrate from the filtrate chamber with the side walls of said suction bell defining division walls to compart the respective partial volume of the filter bed to be cleaned.
Claim 3
Dependent Claim
53 words
Apparatus as defined in claim 1 in which the height of the side walls of the suction bell is at least equal to the height of the filter bed and the suction bell is raisable and lowerable by a stroke length which corresponds at least approximately to the height of the filter bed.
Claim 4
Dependent Claim
29 words
Apparatus as defined in claim 1 or 2 in which means is provided to cause a stabbing of the side walls of the suction bell into the filter bed.
Claim 5
Dependent Claim
25 words
Apparatus as defined in claim 3 in which sharp stabbing edges are provided on the lower edges of the side walls of the suction bell.
Claim 6
Dependent Claim
24 words
Apparatus as defined in claim 3 in which the suction bell is provided with means to exert a compressive loading on said suction bell.
Claim 7
Dependent Claim
25 words
Apparatus as defined in claim 5 in which the suction bell provides an additional loading weight which exerts said compressive loading on the suction bell.
Claim 8
Dependent Claim
16 words
Apparatus as defined in claim 3 in which a vibrator is provided on the suction bell.
Claim 9
Dependent Claim
24 words
Apparatus as defined in claim 1 in which a smoother is carried by the suction bell to smooth the surface of the filter bed.
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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |