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:
Dec. 18, 1990
Filed:
Apr. 25, 1989
Hiroyuki Nakano, Osaka, JP;
Showa Products Company, Osaka, JP;
Abstract
A process for producing a tube having a strength imparting tubular body and a tubular lining member covering and bonded to the inner surface of the tubular body comprises the steps of forming mandrel contact portions on a synthetic resin surface of a lining sheet in the form of a strip and noncontact portions in the surface distributedly among the contact portions, helically winding the lining sheet around a mandrel with the synthetic resin surface positioned inside and with the sheet lapping over itself, bonding the lap to the underlying portion of the wound sheet to form the lining member, and moving the tubular lining member axially of the mandrel in a direction to remove the member therefrom. The lining member formed around the mandrel is smoothly movable axially thereof by virtue of the presence of the contact and noncontact portions distributedly formed over the sheet resin surface.