Pipes and tubular conduits – Flexible – Distinct layers
Reexamination Certificate
2007-08-14
2007-08-14
Hook, James (Department: 3754)
Pipes and tubular conduits
Flexible
Distinct layers
C138S141000, C428S036910
Reexamination Certificate
active
10618556
ABSTRACT:
Pipe or tubing of crosslinked polyethylene (“PEX”) containing less than 2% by wt. carbon black provides improved resistance to oxidizing agents such as chlorine and hypochlorous acid in water. The pipe may be further protected with a thin tubular core (inner layer) of high density polyethylene or chlorinated polyethylene. The pipe may optionally have an oxygen barrier layer, such as poly(ethylene-co-vinyl alcohol) (“EVOH”), contiguously disposed radially outward from the carbon-containing PEX layer. The pipe is suitable for potable water applications and for hot water radiant heating systems.
REFERENCES:
patent: 2916481 (1959-12-01), Gilmont
patent: 3033238 (1962-05-01), Kosewicz
patent: 3096210 (1963-07-01), Boonstra
patent: 3292539 (1966-12-01), Behr et al.
patent: 4087946 (1978-05-01), Harris
patent: 4101699 (1978-07-01), Stine et al.
patent: 4117195 (1978-09-01), Swarbrick et al.
patent: 4614208 (1986-09-01), Skarelius
patent: 5756023 (1998-05-01), Stachowiak
patent: 6098666 (2000-08-01), Wells et al.
patent: 6176269 (2001-01-01), Jarvenkyla
patent: 6197852 (2001-03-01), Lee
patent: 6284178 (2001-09-01), Russell et al.
patent: 6361842 (2002-03-01), Stachowiak
patent: 6376595 (2002-04-01), Palmlof
patent: 6422269 (2002-07-01), Johansson et al.
patent: 6615877 (2003-09-01), Zimmer et al.
patent: 2002/0189697 (2002-12-01), Jarvenkyla
patent: 2004/0028860 (2004-02-01), Dalal et al.
patent: 2004/0045619 (2004-03-01), Backman et al.
patent: 1199161 (2002-04-01), None
patent: 2170206 (1986-07-01), None
patent: WO9949254 (1999-09-01), None
patent: WO9957474 (1999-11-01), None
Standards Australia, AS 2492-(1994)“Cross-Linked Polyethylene (PE-X) Pipe For Hot and Cold Water Applications”, pp. 5-28.
Cabot Corporation, Technical Report—S-115, Dec. 2000, “The Role of Carbon Black Morphology In Reducing UV Oxidation Of Linear Low Density Polyethylene Films”, pp. 1-11.
Cabot Corporation, Technical Report—S-131, Dec. 2002, “Carbon Black Dispersion”, pp. 2-16.
Backman Arthur L.
Dalal Girish T.
Mahabir Carl M.
Dunlap Thoburn T.
Hook James
Laferty Samuel B.
Lubrizol Advanced Materials, Inc.
Powell Joe A.
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