US4305818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum sewage system
Assignee: E Sarlin Oy AB
•
Filing: 1980-09-05
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Granted: 1981-12-15
•
Expires: 2000-09-05
Abstract
Abstract A vacuum sewage system, comprising a collection tank, in which the sewer waste arrives with the aid of vacuum through an entrance pipe and from which it departs from time to time through an exit pipe. The arrival and removal of the sewer waste has been arranged to take place with the aid of one pump. The entrance pipe terminates within the collection tank at a minor distance from the intake aperture of the pump.
Inventors
- 👤 Yrjo Tyllinen
- 👤 Kaj Nyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:08
CPC Classifications
E; E03; E03F; E03F1/00; E03F1/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
An improved apparatus for use in a vacuum sewage system, said apparatus comprising; a collection tank, an entrance pipe affixed to said tank for directing sewer waste as it arrives under vacuum through said entrance pipe into said tank and from which it departs from time to time through an exit pipe affixed to said tank, and a pump for directing, the arrival and removal of the sewer waste into and out of said tank, wherein the improvement comprises: having the entrance pipe terminate within the collection tank at a minor distance from the intake aperture of the pump providing vacuum conditions on a suction side of said pump and having liquid within said tank contributing to formation of vacuum.
Claim 2
Dependent Claim
120 words
An improved apparatus for use in a vacuum sewage system, said apparatus comprising; a collection tank, an entrance pipe affixed to said tank for directing sewer waste as it arrives under vacuum through said entrance pipe into said tank and from which it departs from time to time through an exit pipe affixed to said tank, and a pump for directing, the arrival and removal of the sewer waste into and out of said tank, wherein the improvement comprises: having the entrance pipe terminate within the collection tank at a minor distance from the intake aperture of the pump providing vacuum conditions on a suction side of said pump and having liquid within said tank contributing to formation of vacuum.
Claim 3
Dependent Claim
46 words
A vacuum sewage system according to claim 1, wherein: in the exit pipe there is provided a draining valve and before the draining valve, there is provided a branch pipe fitted with a circulation valve and whereby said branch pipe leads back to the collection tank.
Claim 4
Dependent Claim
26 words
A vacuum sewage system according to claim 1, wherein the intake aperture of the pump carries a suction cone encircling the end of the entrance pipe.
Claim 5
Dependent Claim
18 words
A vacuum sewage system according to claim 1, wherein the end of the entrance pipe is conically narrowing.
Claim 6
Dependent Claim
18 words
A vacuum sewage system according to claim 1, wherein: the end of the entrance pipe is conically widening.
References Cited (Backward Citations)
US3306449A
Cited
US3400822A
Cited
US3419146A
Cited
US3925206A
Cited
US3925206B1
Cited
US4159248A
Cited
US4155851A
Cited
US4139470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |