Check valves

Details Check valves Check valves

2005-09-26

2008-11-04

Mckinnon, Terrell (Department: 4177)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S512400, C137S849000

Reexamination Certificate

active

07445028

ABSTRACT:
Duck-bill type check valves each include an inlet, an outlet spaced longitudinally from the inlet, and a bill adjacent the outlet and having at least one fold extending longitudinally along the bill for enabling unfolding of the at least one fold to open the outlet and permit the flow of fluid from the inlet for discharge through an opening at the outlet in response to minimum fluid forces upon the bill, and to provide the opening with an increased maximum available perimeter.

REFERENCES:
patent: 2818089 (1957-12-01), Mayhill
patent: 2918089 (1959-12-01), McFarland, Jr.
patent: 2922437 (1960-01-01), Rippingilla
patent: 3415485 (1968-12-01), Hirs et al.
patent: 3548417 (1970-12-01), Kischer et al.
patent: 3707986 (1973-01-01), Breen
patent: 4222126 (1980-09-01), Boretos et al.
patent: 4492253 (1985-01-01), Raftis
patent: 4585031 (1986-04-01), Raftis et al.
patent: 4607663 (1986-08-01), Raftis et al.
patent: 5606995 (1997-03-01), Raftis
patent: 5727593 (1998-03-01), Duer
patent: 5931197 (1999-08-01), Raftis et al.
patent: 2001/0054448 (2001-12-01), McFarland
patent: 2006/0054229 (2006-03-01), van der Meijden et al.

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