辞职邮件怎么写专利名称：Grass guard
七年级上册生物知识点总结
告诉你我很爱你发明人：Emily Tsao,Chein-Hwa Tsao,Stephen K. Chan 申请号：US08/370432
如何改ip地址申请日：19950109
钢琴重量公开号：US05678353A
公开日：
公元前英文缩写19971021
专利内容由知识产权出版社提供
摘要：A grass guard for forming a vegetationless border around a perimeter of an object, such as a lawn sprinkler head, is described. One particular embodiment consists of a two layer construction. The top layer is a plastic sheet simulating grass. The bottom layer is made of a heavy grit bonded into a uniform body with a polymer. The layers form a relatively thin, weather resistant, plastically compliant disk with a center hole for stretch, lf-adjusting fit over a pre-installed sprinkler head. The device is also easily cut through with a knife to fit various head locations. The bottom layer has an outside vertical edge with a top rounded corner enclosing the top layer to prevent edge delamination or fraying. An adhesive is provided to bond the grass guard to the neck of the sprinkler head to eliminate gap formation around the head. A hammering board can be ud to facilitate the installation. Optionally, pre-watering the vicinity of the sprinkler head until the ground is softened from moisture further simplifies the installation and enhances the quality. In general, the device can be ud to guard against the growth of vegetation next to any physical objects with the proper tailoring of geometry and choice of associated manufacturing process.
申请人：TSAO; EMILY,TSAO; CHEIN-HWA,CHAN; STEPHEN K.井底之蛙的故事
代理人：Carl D. Titus,James J.Leary, Titus & Aiello Leary自学考试网官网
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