The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 03, 2001
Filed:
Dec. 29, 1998
Thomas N. Prassas, Glendale, AZ (US);
Shannon Bard, Scottsdale, AZ (US);
Aquapore Moisture Systems, Phoenix, AZ (US);
Abstract
The lawn edging (,) is formed by extruding a thermoplastic resin, preferably a thermoplastic resin such as polyethylene containing a dispersion of prevulcanized elastomer granules through a die (,) having a vertical die orifice (,) for forming the wall (,) of the channel (,). The vertical die orifice (,) also contains an element for forming protrusions (,) on a surface of the wall (,). The element preferably forms a horizontal edge on the protrusion (,). The feed rate of the element can be higher than the adjacent sections of the wall (,) such that the extruded material backs up in the die (,) and intermittently feeds through the outlet orifice (,). The channel (,) can contain a lower bead (,) and an upper hollow head member (,) which can be coated with a liquid impervious film (,) and perforated by a laser (,) to form spray apertures (,).