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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 |
| 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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