Pipe joints or couplings – Having plural independent paths – For concentric tubes or pipes
Reexamination Certificate
2002-03-07
2003-05-20
Nicholson, Eric K. (Department: 3679)
Pipe joints or couplings
Having plural independent paths
For concentric tubes or pipes
C285S133110, C285S123100
Reexamination Certificate
active
06565127
ABSTRACT:
OVERVIEW
A pipe coupling and assembly according to the present invention is well suited for use with coaxial pipe systems, such as that disclosed by U.S. Pat. Nos. 5,297,896 and 5,927,762, both to Webb and incorporated herein by reference.
REFERENCES:
patent: 4886305 (1989-12-01), Martin
patent: 5203384 (1993-04-01), Hansen
patent: 5265652 (1993-11-01), Brunella
patent: 5277455 (1994-01-01), Graves et al.
patent: 5398976 (1995-03-01), Webb
patent: 5427474 (1995-06-01), Silvers
patent: 5449204 (1995-09-01), Greene et al.
patent: 5628532 (1997-05-01), Ashcraft
patent: 5687993 (1997-11-01), Brim
patent: 5927762 (1999-07-01), Webb
patent: 6428054 (2002-08-01), Zappa et al.
Struthers Kevin
Webb Michael
Drinker Biddle & Reath LLP
Environ Products Inc.
Nicholson Eric K.
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