Patent US3722681A successfully refreshed from Google Patents.
US3722681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tertiary filtering arrangement
Assignee: Individual
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Filing: 1970-12-28
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Granted: 1973-03-27
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Expires: 1990-12-28
Abstract
Abstract An apparatus for filtering liquids containing suspended solids is disclosed which includes a filter element and a scraper for cleaning the filter as the suspended solids collect on the surface thereof. The scraper is apertured to permit the collected debris to enter within the scraper and the inside of the scraper is connected to a ventable line. The pressure developed by the cleaned liquid on the inside of the filter suffices when the ventable connection is made to force the cleaned water back through the filter thereby flushing off the debris from the outside of the filter and causing it to enter the inside of the scraper and pass through the ventable line thereby cleaning the outside of the filter.
Inventors
- 👤 S Boorujy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:27
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/286; B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/60; B01D29/606; B01D29/62; B01D29/64; B01D29/6438; B01D29/6453; B01D29/6469; B01D29/6484
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
Apparatus for filtering a liquid of biological oxygen demand particles comprising means for mixing said liquid with processed newsprint, an enclosure having an inlet for receiving said liquid under pressure and an outlet for discharging said liquid, a filter interposed between said inlet and said outlet in said enclosure, said filter having a cylindrical fluid receiving surface exposed to said inlet, means for cleaning said filter including a ventable line, an apertured toroidal scraper connected to said ventable line, means for sensing the pressure differential of said liquid between said inlet and said outlet, first means controlled by said pressure sensing means for driving said toroidal scraper over the cylindrical fluid receiving surface thereof, second means controlled by said sensing means for restricting the flow of said liquid from said inlet to said outlet, and third means controlled by said sensing means for venting said ventable line periodically to provide a reverse flow path for said liquid on the outlet side of filter back through said filter and said apertured scraper to said ventable line.
Claim 2
Dependent Claim
175 words
Apparatus for filtering a liquid of biological oxygen demand particles comprising means for mixing said liquid with processed newsprint, an enclosure having an inlet for receiving said liquid under pressure and an outlet for discharging said liquid, a filter interposed between said inlet and said outlet in said enclosure, said filter having a cylindrical fluid receiving surface exposed to said inlet, means for cleaning said filter including a ventable line, an apertured toroidal scraper connected to said ventable line, means for sensing the pressure differential of said liquid between said inlet and said outlet, first means controlled by said pressure sensing means for driving said toroidal scraper over the cylindrical fluid receiving surface thereof, second means controlled by said sensing means for restricting the flow of said liquid from said inlet to said outlet, and third means controlled by said sensing means for venting said ventable line periodically to provide a reverse flow path for said liquid on the outlet side of filter back through said filter and said apertured scraper to said ventable line.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |