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:
Mar. 28, 2000
Filed:
Sep. 01, 1998
PA-Plug, Inc., Edmonton, CA;
Abstract
An ice plug for defining a barrier in a pipeline section filled with water, comprises a hollow, cylindrical body enclosed at a front end and provided with guide means for sliding movement of the plug along and within the pipeline. The body has a diameter smaller than that of the pipeline to define with the latter an annular interspace enclosed at opposed axial ends of the plug. The thickness of the annular space is selected to allow free movement of the body through curves in a pipeline and to form a continuous, annular ice layer firmly engaging the inside wall of the pipeline and the outer surface of said body to thus form, together with the body, a temporary water impermeable barrier within the pipeline. A water supply system fills the interspace with process water.