US3852836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage backwater relief vent
Assignee: Individual
•
Filing: 1973-09-18
•
Granted: 1974-12-10
•
Expires: 1993-09-18
Abstract
Abstract Disclosed is a household sewage collection system employing a backwater relief vent. The relief vent is an externally threaded cylindrical body adapted to replace the clean-out plug and has a centrally located aperture. The aperture is closed with a nonthreaded plug which prevents the escape of sewer gas but is unseated by back pressure exerted thereon to vent any backwater fluid at ground level and thus prevent backwater from rising to the level of the sewer receptacles.
Inventors
- 👤 J Oberholtzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:00
CPC Classifications
E; E03; E03F; E03F7/00; E03F7/02; E03F7/04; Y; Y10; Y10S; Y10S4/00; Y10S4/07; Y10T; Y10T137/00; Y10T137/402; Y10T137/4456; Y10T137/4463
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
A relief vent and plug comprising: a. a first cylindrical body with male threads on the vertical exterior surface thereof and having a centrally located aperture passing vertically therethrough; and b. a second cylindrical body removeably positioned within said aperture substantially sealing said aperture and retained therein only by gravitational force exerted on said second cylindrical body; wherein the bottom portion of said aperture is substantially cylindrical and the top portion thereof is expanded to form a recessed groove in the top face of said first cylindrical body concentric with said cylindrical portion of said aperture, and the external surface of said second cylindrical body is conformed to mate with the surfaces of said aperture.
Claim 2
Dependent Claim
115 words
A relief vent and plug comprising: a. a first cylindrical body with male threads on the vertical exterior surface thereof and having a centrally located aperture passing vertically therethrough; and b. a second cylindrical body removeably positioned within said aperture substantially sealing said aperture and retained therein only by gravitational force exerted on said second cylindrical body; wherein the bottom portion of said aperture is substantially cylindrical and the top portion thereof is expanded to form a recessed groove in the top face of said first cylindrical body concentric with said cylindrical portion of said aperture, and the external surface of said second cylindrical body is conformed to mate with the surfaces of said aperture.
Claim 3
Dependent Claim
58 words
The relief vent and plug defined in claim 1 wherein the plane of the top surface of said second cylindrical body is substantially coplanar with the plane of the top surface of said first cylindrical body and the lower end of said second cylindrical body extends below the plane of the bottom surface of said first cylindrical body.
Claim 4
Dependent Claim
42 words
The relief vent and plug defined in claim 1 including flexible means interconnecting said first cylindrical body and said second cylindrical body, said flexible means being of sufficient length to permit said second cylindrical body to be completely removed from said aperture.
Claim 5
Dependent Claim
117 words
In combination: a. a plurality of sewage collection receptacles; b. a sewage collection line in fluid communication with each of said receptacles and with a sewer main; c. a clean-out port in said sewage collection line below the level of the lowest receptacle and between the receptacles and said sewer main; and d. a relief vent plug closing said clean-out port, said relief vent plug comprising: i. a first cylindrical body with male threads on the vertical exterior surface thereof and having a centrally located aperture passing vertically therethrough; and ii. a second cylindrical body removeably positioned within said aperture substantially sealing said aperture and retained therein only by gravitational force exerted on said second cylindrical body.
Claim 6
Dependent Claim
117 words
In combination: a. a plurality of sewage collection receptacles; b. a sewage collection line in fluid communication with each of said receptacles and with a sewer main; c. a clean-out port in said sewage collection line below the level of the lowest receptacle and between the receptacles and said sewer main; and d. a relief vent plug closing said clean-out port, said relief vent plug comprising: i. a first cylindrical body with male threads on the vertical exterior surface thereof and having a centrally located aperture passing vertically therethrough; and ii. a second cylindrical body removeably positioned within said aperture substantially sealing said aperture and retained therein only by gravitational force exerted on said second cylindrical body.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |