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:
Aug. 20, 1996
Filed:
Jun. 02, 1995
Allen D Mathison, Richfield, MN (US);
Randy D Smith, New Hope, MN (US);
Cherne Industries Incorporated, Minneaplois, MN (US);
Abstract
An inflatable fabric bag plug for sealing low pressure pipelines. The bag plug has a body portion constructed of a coated fabric material and includes a plug body portion, main seam cap strips, first and second end seam cap strips and a plurality of sealing strips which are bonded over all internally and externally exposed fabric edges to prevent leakage when the plug is inflated. The body portion has first and second end closures and opposing tethering assemblies which are bonded over the end closures and to the plug body portion. An inflation assembly and a pressure gauge assembly are provided for inflating and deflating the plug as well as monitoring the plug during use. Bypass assemblies are provided to permit the passage of fluids through the bag plug when inflated in a pipeline.