US3568838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewerage system for houses, particularly in rural areas
Assignee: Landsbygdens Frilidsbebyggelse AB
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Filing: 1968-03-19
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Granted: 1971-03-09
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Expires: 1988-03-19
Abstract
Abstract A sewerage system for houses comprises a mechanical strainer, preferably of the centrifugal filter type, for immediate and efficient separation of solid and semisolid impurities from the waste water before the latter is pumped out through a narrow sewer. Mechanical strainer and pump form a convenient installation unit. A replaceable or renewable filter is included in the mechanical strainer.
Inventors
- 👤 Wolter Appelgren
- 👤 Jan-Olov Jorsback
- 👤 Gudmund Naeslund
- 👤 Ernst Rolf Olsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:41
CPC Classifications
E; E03; E03F; E03F5/00; E03F5/14; E03F5/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
40 words
A waste water treating apparatus according to claim 1, wherein a removable filter screen is interconnected between said container outlet means and said pump to serve as an emergency filter in the event of failure of said aforementioned filter means.
Claim 2
Dependent Claim
23 words
A waste water treating apparatus according to claim 1, wherein a nonreturn valve is interconnected between said pump and said discharge conduit connection.
Claim 3
Dependent Claim
29 words
A waste water treating apparatus according to claim 1, wherein said centrifugal vessel and said water discharging pump are mechanically driven by a single driving motor common to both.
Claim 4
Dependent Claim
29 words
A waste water treating apparatus according to claim 1, wherein means for sensing the liquid level in said container is provided to automatically start and stop said motor means.
Claim 5
Dependent Claim
55 words
A waste water treating apparatus according to claim 1, wherein a capacity compensating tank is connected to said waste water inlet means to be primarily passed by the waste water, said tank having a bottom sloping towards said waste water inlet means so as to draIn therethrough when said intake restricting valve means so permits.
Claim 6
Dependent Claim
159 words
A waste water treating apparatus for use in a household sewerage system and comprising in combination a container having a removable lid portion, a perforated centrifugal vessel open at one end and rotatably mounted in said container, waste water inlet means opening from above into the open end of said vessel, an intake restricting valve means in said inlet means, water outlet means at the bottom of said container, a water discharging pump connected to said outlet means of the container, a discharge conduit connection communicating with said pump, motor means for driving the centrifugal vessel and water discharging pump, liquid level sensing means within said container for governing the operation of said motor means, and filter means in the centrifugal vessel capable of effectively straining the waste water passing therethrough so as to separate substantially all solid and semisolid contaminants, including fat accumulations and saponification remnants therefrom and to keep these separated contaminants substantially dry until disposed of.
Claim 7
Dependent Claim
19 words
A waste water treating apparatus according to claim 7, wherein said filter means of said centrifugal vessel is replaceable.
Claim 8
Dependent Claim
31 words
A waste water treating apparatus according to claim 8, wherein said replaceable filter means comprises filter material incorporating agents capable of assisting in the waste water purification process by chemical action.
Claim 9
Dependent Claim
25 words
A waste water treating apparatus according to claim 7, wherein said filter means of said centrifugal vessel is replaceable and made of combustible organic material.
Claim 10
Dependent Claim
28 words
A waste water treating apparatus according to claim 7, wherein said filter means of said centrifugal vessel is made of inorganic material capable of being regenerated by heating.
Claim 11
Dependent Claim
34 words
A waste water treating apparatus according to claim 11, wherein said filter means incorporates electrical resistance heating means for regenerating the filter by heat treatment while it remains in place in said centrifugal vessel.
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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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |