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Class Information
Number: 405/162
Name: Hydraulic and earth engineering > Subterranean or submarine pipe or cable laying, retrieving, manipulating, or treating > Submerging, raising, or manipulating line of pipe or cable in or from marine environment > Entrenched or buried > Entrenching or burying apparatus guided by pre-positioned pipe or cable > With apparatus buoyancy control
Description: Method or apparatus in which the device guided along the string or conduit includes variable ballast means whereby the attitude or the distance below the water surface of the device is controlled while the device is positioning the string or conduit beneath the bottom.










Patents under this class:

Patent Number Title Of Patent Date Issued
8647016 Submarine pipeline towing equipment, system and process Feb. 11, 2014
7025533 Concentrated buoyancy subsea pipeline apparatus and method Apr. 11, 2006
6705029 Trenching machine Mar. 16, 2004
6579040 Method and apparatus for air can vent systems Jun. 17, 2003
6457527 Apparatus and method for adding buoyancy to riser with inflatable floatation collar Oct. 1, 2002
6257337 Submerged riser tensioner Jul. 10, 2001
6022173 Underwater trenching system Feb. 8, 2000
5639185 Underwater trenching system Jun. 17, 1997
5456551 Underwater trenching system Oct. 10, 1995
4974995 Pressure actuated buoy flattener Dec. 4, 1990
4710059 Method and apparatus for simultaneous trenching and pipe laying in an arctic environment Dec. 1, 1987
4586850 Underwater trenching system May. 6, 1986
4516880 Underwater trenching apparatus May. 14, 1985
4479741 Device for laying underground or digging up subsea conduits Oct. 30, 1984
4470720 Underwater trenching & pipelaying apparatus Sep. 11, 1984
4410297 Marine continuous pipe laying system Oct. 18, 1983
4389139 Oscillating jet head underwater trenching apparatus Jun. 21, 1983
4330225 System for entrenching submerged elongated structures May. 18, 1982
4274757 Immersion/suspension method for the submarine deployment of high voltage transmission cable Jun. 23, 1981
4274760 Self-propelled underwater trenching apparatus and method Jun. 23, 1981
4191494 Apparatus of effecting buoyancy on submerged articles Mar. 4, 1980
4149326 Machine for digging a trench beneath a submerged pipeline Apr. 17, 1979
4044566 Machine for forming trenches for pipelines or the like in the sea bed Aug. 30, 1977











 
 
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