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:
Apr. 20, 1976
Filed:
Nov. 08, 1974
Richard E Larson, Minnetonka, MN (US);
Cherne Industrial, Inc., Edina, MN (US);
Abstract
An inflatable packer positionable in the interior of pipes for packing a sealant material into a void or joint in the pipe wall. Inflatable outer casings mounted on a support rim are utilized to seal off the area surrounding the void or joint. The support rim is constructed in sections which can be transported through a relatively small opening and utilized in a large diameter pipe. Sealant material injected into an open channel between the casings is forced into the void or joint by inflating an inner casing positioned between the outer casings. A flexible liner positioned between the sealant material and the inflatable casings prevents the sealant from adhering to the inflatable casings.