Patent US3983659A successfully refreshed from Google Patents.
Patent US3732983A successfully refreshed from Google Patents.
US3732983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cleaning loose filtering material in slow water filled water supply filters
Assignee: Individual
•
Filing: 1971-03-29
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Granted: 1973-05-15
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Expires: 1991-03-29
Abstract
Abstract An apparatus for cleaning loose filtering material in slow water-filled water supply filters, comprising a washing chamber equipped with means for its movement relative to the surface of the loose filtering material being cleaned. Mounted inside the washing chamber are washing tubes to feed clean water into the layer of filtering material to be washed. The washing chamber communicates with a suction pipe which evacuates dirty water therefrom. The chamber is provided with means for regulating its pressure upon the filtering material by controlling its degree of buoyancy.
Inventors
- 👤 B Volokh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:05
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/02; B01D24/20; B01D24/205; B01D24/46; B01D24/4605; B01D24/4621; B01D24/4631; B01D24/4636
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
175 words
An apparatus for cleaning loose filtering material in slow water-filled water supply filters, comprising: a washing chamber having an open bottom and submersible in the water of the filter to rest on the surface of a layer of filtering material to be cleaned; means for moving said washing chamber on the surface of the layer of filtering material; washing tubes mounted in said chamber to feed clean water into said layer of filtering material to be washed; a suction pipe in said chamber to evacuate dirty water from said washing chamber; and means for regulating the degree of buoyancy of the washing chamber in the water of the filter to regulate the pressure of said washing chamber upon the layer of filtering material, said means for regulating the degree of buoyancy of said washing chamber comprising at least one closed container associated with said chamber, said container having a lower port through which water in the filter can enter and leave the container and means for filling said container with a controlled amount of gas.
Claim 2
Independent Claim
175 words
An apparatus for cleaning loose filtering material in slow water-filled water supply filters, comprising: a washing chamber having an open bottom and submersible in the water of the filter to rest on the surface of a layer of filtering material to be cleaned; means for moving said washing chamber on the surface of the layer of filtering material; washing tubes mounted in said chamber to feed clean water into said layer of filtering material to be washed; a suction pipe in said chamber to evacuate dirty water from said washing chamber; and means for regulating the degree of buoyancy of the washing chamber in the water of the filter to regulate the pressure of said washing chamber upon the layer of filtering material, said means for regulating the degree of buoyancy of said washing chamber comprising at least one closed container associated with said chamber, said container having a lower port through which water in the filter can enter and leave the container and means for filling said container with a controlled amount of gas.
Claim 3
Dependent Claim
19 words
Apparatus as claimed in claim 1 wherein said washing chamber has an open top to communicate with the atmosphere.
References Cited (Backward Citations)
US1617654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |