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. 01, 1997
Filed:
Jun. 02, 1995
Allen D Mathison, Richfield, MN (US);
Randy D Smith, New Hope, MN (US);
Cherne Industries Incorporated, Minneapolis, MN (US);
Abstract
An assembly process for inflatable fabric bag plugs used to seal low pressure pipelines. The assembly process steps include marking and cutting coated fabric elements from a predetermined woven fabric and a plurality of sealing strips. The fabric elements and sealing strips include a plug body portion, main seam cap strips and first and second end seam cap strips. The process steps further include forming a flat tubular plug body from the plug body portion and bonding sealing rib extrusions thereto. A first end closure is formed in the plug body, a first tethering assembly is bonded over the first end closure and ports are installed therethrough for receiving an inflation assembly and a gauge assembly. A second end closure is formed in the plug body and an opposing tethering assembly is formed and attached thereover. The main seam cap strips, the first and second end seam cap strips and sealing strips are bonded over all internally and externally exposed fabric edges of the plug body to prevent leakage when the plug is inflated.