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公开(公告)号:US06202749B1
公开(公告)日:2001-03-20
申请号:US09244406
申请日:1999-02-04
申请人: David L. Adams , Mary E. Adams
发明人: David L. Adams , Mary E. Adams
IPC分类号: E03B318
CPC分类号: E21B41/0021 , E03B3/16
摘要: A well screen for preventing contaminants such as debris, pests, and insects from falling into the well water. The well screen includes a barrier having top and bottom faces with a plurality of apertures therethrough. A plurality of elongate hanging arms are upwardly extended from the top face of the barrier. The hanging arms each have an outwardly extending upper extent.
摘要翻译: 用于防止诸如碎片,害虫和昆虫等污染物的井筛漏入井水中。 井眼屏幕包括具有顶表面和底面的屏障,其中穿过多个孔。 多个细长悬臂从屏障的顶面向上延伸。 悬挂臂各具有向外延伸的上限。
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2.
公开(公告)号:US5356955A
公开(公告)日:1994-10-18
申请号:US980444
申请日:1992-11-23
IPC分类号: C08G81/02 , C08J3/00 , C08J3/12 , C08F265/08 , C08F255/04 , C08F255/06 , C08F257/02
CPC分类号: C08G81/021 , C08J3/005 , C08J3/12 , C08J3/126 , C08J2321/02 , C08J2423/02 , Y10S525/902
摘要: Stable aqueous artificial latices having a core-shell structure are prepared from two otherwise incompatible polymers in a blend also including a copolymer of said polymers. For example, an artificial latex in which the particles have a styrene-acrylonitrile core and an EPDM shell can be prepared.
摘要翻译: 具有核 - 壳结构的稳定的水性人造胶乳由共混物中的两种否则不相容的聚合物制备,还包括所述聚合物的共聚物。 例如,可以制备其中具有苯乙烯 - 丙烯腈纤维素芯和EPDM壳的颗粒的人造胶乳。
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