Flap valve

Details Flap valve Flap valve

2003-10-29

2004-07-20

Holtje, Nelson C. (Department: 2913)

Environmental heating and cooling; fluid handling and sanitary e

Fluid handling or treatment equipment

Valve or body therefor

Design Patent

active

D0493209

CLAIM:
The ornamental design for a flap valve, as shown and described.

REFERENCES:
patent: D53220 (1919-04-01), Genn
patent: 3541945 (1970-11-01), Wexler
patent: 3628213 (1971-12-01), Ramo
patent: 3814542 (1974-06-01), Iglesias et al.
patent: 4157113 (1979-06-01), Karran et al.
patent: D297382 (1988-08-01), Swett
patent: 5046408 (1991-09-01), Eugenio
patent: 5547422 (1996-08-01), Seboldt
patent: D397431 (1998-08-01), Meyer
patent: D399948 (1998-10-01), Tsuji
patent: D417905 (1999-12-01), Kallenbach et al.
patent: 6132626 (2000-10-01), Hart

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