Class 264/171.12 - Hollow preform

Subclass of Class 264 - Plastic and nonmetallic article shaping or treating: processes
Definition: Processes under subclass171.1
No. of patents: 82
Last issue date: 06/22/2010

Number	Title	Issue Date
3972761	Wrapping of pipes or tubes A steel pipe with longitudinal welding seam is wrapped helically by means of a polyethylene ribbon which is normally stretched, but temporary stretch relief provides for a thicker envelope above and adjacent to the seam. A ribbon deflector roll and a pres...	08/03/1976
3957942	Process of coating an elongated support A method of extruding a coating or sheath onto an elongated support which comprises radially feeding the material into an inlet end of an extrusion head and decompressing, homogenizing, decompressing and compacting the material around a sleeve which surro...	05/18/1976

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