US3941149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve
Assignee: Baxter International Inc
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Filing: 1974-11-11
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Granted: 1976-03-02
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Expires: 1994-11-11
Abstract
Abstract A duckbill-umbrella valve capable of resisting undesired flow is provided by a cylindrical elongated member defining a passageway and including converging flexible lips which are strengthened by a radially outward portion of the cylindrical elongated member surrounding the flexible lips.
Inventors
- 👤 Herbert Mittleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:12
CPC Classifications
A; A61; A61M; A61M39/00; A61M39/22; A61M39/24; F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K15/147; F16K15/148; F16K17/00; F16K17/18; F16K17/19; A61M2039/242; A61M2039/2426; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/7772; Y10T137/7837; Y10T137/7879; Y10T137/788; Y10T137/7882; Y10T137/7888; Y10T137/789
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
192 words
A unitary valve comprising, in combination: a generally cylindrical elongated member defining a central passageway therethrough, said elongated member integrally including an internal duckbill lips configuration with said duckbill lips extending radially inward to normally close said passageway for preventing transfer of fluid in a first direction and said lips being responsive to a predetermined fluid pressure in a second direction to open said passageway, said elongated member having an open bore at one end which open bore extends through a portion of said elongated member toward its opposite end, said elongated member having said duckbill lips closure formed at said opposite end, said elongated member having a substantially greater material thickness at said opposite end than at the portion thereof adjacent said bore, said greater material thickness operating to bias said duckbill lips together to prevent said duckbill from opening in response to a pressure below said predetermined pressure; and an annular umbrella portion integrally extending from said elongated member, normally checking fluid flow generally in said second direction, and flexibly responsive to a predetermined fluid pressure generally in said first direction to allow fluid flow generally in said first direction.
Claim 2
Dependent Claim
192 words
A unitary valve comprising, in combination: a generally cylindrical elongated member defining a central passageway therethrough, said elongated member integrally including an internal duckbill lips configuration with said duckbill lips extending radially inward to normally close said passageway for preventing transfer of fluid in a first direction and said lips being responsive to a predetermined fluid pressure in a second direction to open said passageway, said elongated member having an open bore at one end which open bore extends through a portion of said elongated member toward its opposite end, said elongated member having said duckbill lips closure formed at said opposite end, said elongated member having a substantially greater material thickness at said opposite end than at the portion thereof adjacent said bore, said greater material thickness operating to bias said duckbill lips together to prevent said duckbill from opening in response to a pressure below said predetermined pressure; and an annular umbrella portion integrally extending from said elongated member, normally checking fluid flow generally in said second direction, and flexibly responsive to a predetermined fluid pressure generally in said first direction to allow fluid flow generally in said first direction.
Claim 3
Dependent Claim
18 words
A unitary valve as described in claim 1, wherein said valve is formed in a unitary molded construction.
Claim 4
Dependent Claim
20 words
A unitary valve as described in claim 1, wherein said generally cylindrical elongated member has a substantially circular cross-sectional configuration.
References Cited (Backward Citations)
US456028A
Cited
US3159176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |