US4324097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-return valve
Assignee: Carl Freudenberg KG
•
Filing: 1980-12-03
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Granted: 1982-04-13
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Expires: 2000-12-03
Abstract
Abstract In a one way non-return valve comprising a cylindrical duct, a cone in said duct with its apex pointing in the direction of flow and provided with a plurality of apertures, and a membrane lying on the downstream surface of the cone and clamped at the outer circumference, the membrane having a central aperture, the improvement which comprises employing a cone having an apex angle of about 140° to 160°, the membrane comprising a disk of elastomeric material having a central circular aperture which engages the hollow cone under bias. Advantageously the apertures in the cone are a series of concentrically disposed, round or long-oval apertures, the hollow cone has an apex angle of about 154° and the total area of the apertures in the cone is about twice as great as the area of the aperture in the membrane.
Inventors
- 👤 Wilhelm Schmitt
- 👤 Toyotake Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:51
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/30; F01N3/34; F16; F16K; F16K15/00; F16K15/14; F16K15/1402; F16K15/144; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/784; Y10T137/7854; Y10T137/7857
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
165 words
In a combustion and exhaust system of an internal combustion engine, an exhaust manifold for combustion gases and means for supplying fresh air to the exhaust manifold so as to detoxify the exhaust gases, the improvement which comprises including in the exhaust manifold a one way non-return valve comprising a cylindrical duct, a cone in said duct having an apex angle of about 140° to 160° with its apex pointing in the direction of flow and provided with a plurality of apertures, and a membrane lying on the downstream surface of the cone and effectively clamped to the duct at the outer membrane circumference, the membrane comprising a disk of elastomeric material having a central circular aperture and which engages the hollow cone under an inherent elastic bias to completely seal the cone apertures in the closed state, the apertures of the cone having a total area which is about 1.5 to 3 times as large as the area of the aperture in the membrane.
Claim 2
Dependent Claim
165 words
In a combustion and exhaust system of an internal combustion engine, an exhaust manifold for combustion gases and means for supplying fresh air to the exhaust manifold so as to detoxify the exhaust gases, the improvement which comprises including in the exhaust manifold a one way non-return valve comprising a cylindrical duct, a cone in said duct having an apex angle of about 140° to 160° with its apex pointing in the direction of flow and provided with a plurality of apertures, and a membrane lying on the downstream surface of the cone and effectively clamped to the duct at the outer membrane circumference, the membrane comprising a disk of elastomeric material having a central circular aperture and which engages the hollow cone under an inherent elastic bias to completely seal the cone apertures in the closed state, the apertures of the cone having a total area which is about 1.5 to 3 times as large as the area of the aperture in the membrane.
Claim 3
Dependent Claim
18 words
A non-return valve according to claim 1, wherein the hollow cone has an apex angle of about 154°.
Claim 4
Dependent Claim
31 words
A non-return valve according to claim 1, wherein the total area of the apertures in the cone is about twice as great as the area of the aperture in the membrane.
Claim 5
Dependent Claim
21 words
A non-return valve according to claim 1, wherein the apertures in the cone are a series of concentrically disposed, round apertures.
Claim 6
Dependent Claim
42 words
A non-return valve according to claim 4, wherein the hollow cone has an apex angle of about 154° and the total area of the apertures in the cone is about twice as great as the area of the aperture in the membrane.
Claim 7
Dependent Claim
21 words
A non-return valve according to claim 1, wherein the apertures in the cone are a series of concentrically disposed, long-oval apertures.
References Cited (Backward Citations)
GB198929A
Cited
US2897835A
Cited
US3176712A
Cited
US3342208A
Cited
DE2362075A1
Cited
US3850190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |