Cleaning and liquid contact with solids – Processes – Using solid work treating agents
Reexamination Certificate
2009-01-08
2011-11-08
Barr, Michael (Department: 1711)
Cleaning and liquid contact with solids
Processes
Using solid work treating agents
C015S003500, C015S003520, C015S104061, C015S104062, C134S006000, C134S022100
Reexamination Certificate
active
08052801
ABSTRACT:
A method and system for launching a pipeline pig includes the steps of compressing a modulating bypass valve of a pipeline pig and installing a locking means to temporally maintain the bypass valve in the compressed state. Once the pig has travelled a predetermined distance through the pipeline, the locking means is released and retrieved through the launch trap door. The locking means is preferably a launching pin having a clip attachment that receives the clips of a retractable lead. The lead is housed by a retraction device that is detachably secured to the launch trap door. The modulating valve has sufficient mass and aerodynamic drag to overcome the force of a gas spring. The valve moves between a retracted and compressed position substantially instantaneously upon the pipeline pig stalling and between the compressed and retracted position substantially instantaneously upon the pipeline pig accelerating.
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International Search Report and Written Opinion, issued by the International Searching Authority (ISA/US) on Mar. 15, 2010 (PCT/US10/20088); 9 pages.
Cooper Charles Culver Gidden
Freeman Eric N.
Henault Mark Russell
Nelson Scott Douglas
Strong Robert F.
Barr Michael
Dennis Caitlin N
Gable & Gotwals
TDW Delaware Inc.
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