patent/US-6681856-B1

http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6681856-B1

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Predicate	Object
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filingDate	2003-05-16-04:00^^<http://www.w3.org/2001/XMLSchema#date>
grantDate	2004-01-27-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor	http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_549e3531115c37b28d01c51da09fe8cf http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bddf8be3dc6a1002448d2dfc9fbf84f0 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_19752ed78081c61714f5ea4ac9debbdc
publicationDate	2004-01-27-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber	US-6681856-B1
titleOfInvention	Methods of cementing in subterranean zones penetrated by well bores using biodegradable dispersants
abstract	The present invention provides methods of cementing subterranean zones penetrated by well bores using biodegradable dispersants. A cement composition of the invention comprises a hydraulic cement, sufficient water to form a slurry and a water soluble biodegradable cement dispersant comprising a polyamide graft copolymer containing at least o e side chain formed from aldehydes and sulfur-containing acids or their salts.
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