US3870632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traveling filter for use with filter medium incineration process
Assignee: Calgon Corp
•
Filing: 1970-09-30
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Granted: 1975-03-11
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Expires: 1990-09-30
Abstract
Abstract A traveling filter is disclosed which carries filter medium such as sand, for example, and a substance to be filtered, such as sewage, through a distance and time period sufficient to filter the sewage, after which the entire fouled filter medium mass is passed to a furnace for incineration. After incineration, in which most of the combustible material is burned off and the filter medium is left in a more or less unfouled condition, the filter medium is optionally screened, and then returned to re-use in the traveling filter.
Inventors
- 👤 Donald Baldwin Erskine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:18
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/12; C02F11/121; C02F11/123; B; B01; B01D; B01D33/00; B01D33/04; B01D33/70; B01D33/72
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
58 words
Method of treating sewage comprising placing an unoxidizable filter medium on a movable permeable support, depositing sewage on said filter medium, collecting substantially liquid effluent therefrom, withdrawing said support and depositing fouled filter medium in a furnace, incinerating the filter medium and sewage solids therein, recovering the filter medium, and replacing the filter medium on the moving support.
Claim 2
Dependent Claim
58 words
Method of treating sewage comprising placing an unoxidizable filter medium on a movable permeable support, depositing sewage on said filter medium, collecting substantially liquid effluent therefrom, withdrawing said support and depositing fouled filter medium in a furnace, incinerating the filter medium and sewage solids therein, recovering the filter medium, and replacing the filter medium on the moving support.
Claim 3
Dependent Claim
58 words
METHOD OF TREATING SEWAGE COMPRISING PLACING AN UNOXIDIZABLE FILTER MEDIUM ON A MOVABLE PERMEABLE SUPPORT, DEPOSITING SEWAGE ON SAID FILTER MEDIUM, COLLECTING SUBSTANTIALLY LIQUID EFFLUENT THEREFROM, WITHDRAWING SAID SUPPORT AND DEPOSITING FOULED FILTER MEDIUM IN A FURNACE, INCINERATING THE FILTER MEDIUM AND SEWAGE SOLIDS THEREIN, RECOVERING THE FILTER MEDIUM, AND REPLACING THE FILTER MEDIUM ON THE MOVING SUPPORT.
Claim 4
Dependent Claim
58 words
METHOD OF TREATING SEWAGE COMPRISING PLACING AN UNOXIDIZABLE FILTER MEDIUM ON A MOVABLE PERMEABLE SUPPORT, DEPOSITING SEWAGE ON SAID FILTER MEDIUM, COLLECTING SUBSTANTIALLY LIQUID EFFLUENT THEREFROM, WITHDRAWING SAID SUPPORT AND DEPOSITING FOULED FILTER MEDIUM IN A FURNACE, INCINERATING THE FILTER MEDIUM AND SEWAGE SOLIDS THEREIN, RECOVERING THE FILTER MEDIUM, AND REPLACING THE FILTER MEDIUM ON THE MOVING SUPPORT.
Claim 5
Dependent Claim
11 words
Method of claim 1 in which the filter medium is sand.
Claim 6
Dependent Claim
15 words
Method of claim 1 in which the moving permeable support is a perforated continuous belt.
References Cited (Backward Citations)
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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 |