Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hossein Eslambolchi1
John Sinclair Huffman1
Date of Patent
March 3, 2009
1Patent Application Number
109712251
Date Filed
October 22, 2004
1Patent Citations Received
Patent Primary Examiner
Patent abstract
The present invention is an apparatus and method for repairing a collapsed underground duct for a fiber cable. A head is inserted into the duct until the collapsed section is sensed. Power, such as hydraulic or pneumatic pressure of electric potential, is applied to the head, actuating an expansion member that engages the duct wall and applies a force to it, forcing it to a non-collapsed state. The head may be fed through the non-collapsed duct by applying air pressure behind it, forcing through the duct until it encounters the collapsed section.
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