Patent US4297751A successfully refreshed from Google Patents.
US4297751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewer system
Assignee: Wartsila Oy AB
•
Filing: 1979-08-17
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Granted: 1981-11-03
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Expires: 1999-08-17
Abstract
Abstract A sewer system in which partial vacuum is used for transporting sewage through a sewer pipe to a collecting chamber or the like. The system comprises only a few sewage producing units, preferably only one at a time usable unit. The length of the sewer pipe from a sewage producing unit to the collecting chamber is comparatively small and the operating devices of the system are arranged to generate vacuum in the sewer pipe principally only for the time required for transporting each separate sewage discharge emitted into the sewer pipe. Preferably, the operating devices are arranged to stop generating the vacuum before the actual transport of the sewage takes part.
Inventors
- 👤 Henry Olin
- 👤 Nils Tallberg
- 👤 Martti Varis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:42
CPC Classifications
E; E03; E03F; E03F1/00; E03F1/006; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3109
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
127 words
A sewer system including means for generating a partial vacuum for transporting sewage through a sewer pipe to a collecting chamber for an installation comprising a small number of sewage producing units, preferably only one of said sewage producing units being usable at a time, said sewer pipe between each said sewage producing unit and said collecting chamber having a small total volume, control means for starting and stopping said partial vacuum generating means, and means for activating said control means for generating a vacuum in said sewer pipe principally only for the time required for transporting each separate sewage discharge from a selected one of said small number of sewage producing units to said collecting chamber, and said sewer pipe being otherwise under a higher pressure.
Claim 2
Dependent Claim
127 words
A sewer system including means for generating a partial vacuum for transporting sewage through a sewer pipe to a collecting chamber for an installation comprising a small number of sewage producing units, preferably only one of said sewage producing units being usable at a time, said sewer pipe between each said sewage producing unit and said collecting chamber having a small total volume, control means for starting and stopping said partial vacuum generating means, and means for activating said control means for generating a vacuum in said sewer pipe principally only for the time required for transporting each separate sewage discharge from a selected one of said small number of sewage producing units to said collecting chamber, and said sewer pipe being otherwise under a higher pressure.
Claim 3
Dependent Claim
41 words
A system according to claim 1, including sewage discharge means, said control means being connected to said activating means and to said sewage discharging means, and means for operating and stopping said vacuum generating means before activating said sewage discharging means.
Claim 4
Dependent Claim
28 words
A system according to claim 1 or 2, in which said vacuum generating means includes a source of pressurized gas, and a gas pressure driven vacuum generating device.
Claim 5
Dependent Claim
26 words
A system according to claim 1, in which said vacuum generating means includes a source of compressed air, and a gas pressure driven vacuum generating ejector.
Claim 6
Dependent Claim
49 words
A system according to claim 1, including a collecting tank, said collecting chamber being arranged as a flow connection means between said sewer pipe and said collecting tank under atmospheric pressure, said collecting chamber being upstream of and in gravity flow connection with the interior of said collecting tank.
Claim 7
Dependent Claim
49 words
A system according to claim 5, in which downstream of the outlet end of said sewer pipe there is an auxiliary space in connection with said vacuum generating means, and the total volume of said auxiliary space being at least as large as the volume of said sewer pipe.
Claim 8
Dependent Claim
31 words
A system according to claim 6, in which said auxiliary space is at least partly formed by a separate air tank connected to a suction duct of said vacuum generating device.
Claim 9
Dependent Claim
21 words
A system according to claim 1, in which the total volume to be put under vacuum is smaller than 100 liters.
Claim 10
Dependent Claim
21 words
A system according to claim 1, in which the total volume to be put under vacuum is smaller than 50 liters.
Claim 11
Dependent Claim
34 words
A system according to claim 1, being arranged to function as a sewer system of a railway car or of another moving unit having a source of pressurized gas suitable for rapid vacuum generation.
Claim 12
Dependent Claim
81 words
A system according to claim 1, in which a portion of said collecting chamber is below the outlet end of said sewer pipe and has a volume (V) corresponding approximately to the normal volume of a single discharge of sewage or is only slightly bigger, said system having, in connection with said collecting chamber at its upper edge, a container space big enough to receive as much fluid as is containable at one time in any of said sewage producing units.
Claim 13
Dependent Claim
23 words
A system according to claim 1, in which said sewer pipe is in direct open connection with said collecting chamber or the like.
Claim 14
Dependent Claim
20 words
A system according to claim 1, in which the volume of said sewer pipe is at the most 30 liters.
Claim 15
Dependent Claim
20 words
A system according to claim 1, in which the volume of said sewer pipe is at the most 20 liters.
Claim 16
Dependent Claim
38 words
A system according to claim 1, in which said collecting chamber is provided with a mechanically working emptying device connected to said control means so as to be operative after every discharge of sewage into said collecting chamber.
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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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |