Patent US3791401A successfully refreshed from Google Patents.
US3791401A
Expired / Lapsed
US
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Vented sanitary trap unit
Assignee: CAST IRON SOIL PIPE INST
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Filing: 1971-06-14
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Granted: 1974-02-12
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Expires: 1991-06-14
Abstract
Abstract A trap unit for installation into a sanitary drainage system, including a generally U-shaped trap body having a vent element mounted on the inlet leg. The vent element has a check valve to prevent overflows, and the trap unit functions to prevent self siphonage of its liquid seal.
Inventors
- 👤 J Gorman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:43
CPC Classifications
F; F16; F16K; F16K24/00; F16K24/02; Y; Y10; Y10T; Y10T137/00; Y10T137/3149; Y10T137/3185; Y10T137/3222; Y10T137/3258; Y10T137/4456; Y10T137/4463; Y10T137/4576; Y10T137/4606
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
163 words
A trap unit for connection to a plumbing fixture having an outlet with a substantially vertically extending end portion, said unit including: a trap body, including a substantially vertical inlet leg and an exit leg connected at their lower ends by a U-shaped bend portion, said inlet leg being adapted for direct connection to said vertically extending end portion, said bend portion being designed to retain a portion of liquid flowing through said trap body to form a seal between said exit leg and said inlet leg, said liquid seal normally extending to a predetermined height in said inlet leg, and said inlet leg having a lateral trap body port therein spaced vertically above said predetermined liquid seal height such that liquid entering said trap unit flows past said port in a substantially vertical direction; means on the outer ends of said inlet and exit legs for connecting said trap body into a drainage system; and a vent element secured to said port.
Claim 2
Dependent Claim
163 words
A trap unit for connection to a plumbing fixture having an outlet with a substantially vertically extending end portion, said unit including: a trap body, including a substantially vertical inlet leg and an exit leg connected at their lower ends by a U-shaped bend portion, said inlet leg being adapted for direct connection to said vertically extending end portion, said bend portion being designed to retain a portion of liquid flowing through said trap body to form a seal between said exit leg and said inlet leg, said liquid seal normally extending to a predetermined height in said inlet leg, and said inlet leg having a lateral trap body port therein spaced vertically above said predetermined liquid seal height such that liquid entering said trap unit flows past said port in a substantially vertical direction; means on the outer ends of said inlet and exit legs for connecting said trap body into a drainage system; and a vent element secured to said port.
Claim 3
Dependent Claim
24 words
A trap unit as recited in clAim 1, wherein said trap body port is spaced about 2 inches above said predetermined liquid seal height.
Claim 4
Dependent Claim
46 words
A trap unit as recited in claim 1, wherein said vent element is arranged to admit air to said inlet leg when the vent element is substantially free of liquid, and includes valve means arranged to close in response to liquid rising within said vent element.
Claim 5
Dependent Claim
87 words
A trap unit as recited in claim 1, wherein said vent element comprises: an upper body portion having a vent opening therein; a lower body portion having a port therein, said lower body port being connected with said trap body port; means detachably securing said body portions together; and a valve unit removably mounted between said body portions, and including a valve element arranged to be closed by liquid rising within said lower body portion and open when said lower body portion is substantially free of liquid.
Claim 6
Dependent Claim
25 words
A trap unit according to claim 4 wherein said body portions are cup shaped and are secured together rim-to-rim so as to form a chamber.
Claim 7
Dependent Claim
89 words
A trap unit as recited in claim 5, wherein said valve unit includes: a valve body having a valve port therein, said valve element being positioned beneath said valve port to confront said valve port; and guide means attached to said valve body for guiding said valve element between an upper position wherein it seals said valve port, and a lower position wherein said valve port is open, said valve element being movable from said lower position to said upper position by liquid rising within said lower body portion.
Claim 8
Dependent Claim
39 words
a trap unit as recited in claim 6, wherein said valve element has at least one opening therein spaced outwardly from a sealing area thereof, and wherein said guide means includes a vertical guide post extending through said opening.
Claim 9
Dependent Claim
103 words
A trap unit according to claim 6 wherein said valve body comprises a cup-shaped outer member having a base with an opening therein larger than the sealing area of said valve element, and a tapered flange extending from its rim, said flange being secured between the rims of said upper and lower body portions with the remainder of said cup-shaped outer member extending into said lower body portion, said valve body further including a generally cylindrical inner member supported in said cup-shaped outer member above the base, said valve port being formed on the end of said inner member closest to said base.
Claim 10
Dependent Claim
60 words
A trap unit according to claim 8 wherein said vent element further includes an orifice plate secured between said upper and lower body portions above said valve unit, and a generally L-shaped conduit having its vertical leg attached to the port of said lower body portion and its horizontal leg attached to the trap body port of said inlet leg.
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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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |