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:
Oct. 10, 2000
Filed:
Sep. 11, 1998
Siegfried Schwert, Berlin, DE;
Andre Rose, Berlin, DE;
Andreas Huttemann, Berlin, DE;
Peter Marquardt, Berlin, DE;
Wolf Rabold, Berlin, DE;
Abstract
A flexible tube for lining pipes and ducts as well as a method and an apparatus for manufacturing thereof are suggested. The flexible tube is composed of a coated fabric of high resilient warp threads as well as woof threads having lower elasticity. With the flexible tube thus suggested, strong curvatures or angles being present in the pipes can be lined without wrinkles and all-over for the first time. This is enabled in that the high resilient warp threads are stabilized by covering yarn upon straight pipe portions and hence comprise a limited linear extension such that the flexible tube can be placed inside the pipe in quality. In the curved pipe portions the high elasticity of the basic warp thread is activated by a force increase during passing through these portions by compensating the forces of the covering yarn, such that the flexible tube closely fits to the inner pipe wall, all-over and without any wrinkles in these regions. The coating of the high resilient yarn is enabled by means of a new coating technique.