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Class Information
Number: 175/48
Name: Boring or penetrating the earth > With signaling, indicating, testing or measuring > Measuring or indicating drilling fluid (1) pressure, or (2) rate of flow
Description: Subject matter relating to a drilling fluid system forming a part of the boring means and a step or means to (1) measure or indicate the pressure of the drilling fluid or (2) measure or indicate the rate of flow of said drilling fluid at a specified location in said system.

Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
4401169 System for lagtime measurement during drilling Aug. 30, 1983
4384807 Excavation controlling method in hydraulic shield tunnelling May. 24, 1983
4310058 Well drilling method Jan. 12, 1982
4310050 Well drilling apparatus Jan. 12, 1982
4295366 Drilling fluid circulating and monitoring system and method Oct. 20, 1981
4282939 Method and apparatus for compensating well control instrumentation for the effects of vessel heave Aug. 11, 1981
4282939 Method and apparatus for compensating well control instrumentation for the effects of vessel heave Aug. 11, 1981
4276943 Fluidic pulser Jul. 7, 1981
4273212 Oil and gas well kick detector Jun. 16, 1981
4262343 Pressure pulse detection apparatus Apr. 14, 1981
4253530 Method and system for circulating a gas bubble from a well Mar. 3, 1981
4250974 Apparatus and method for detecting abnormal drilling conditions Feb. 17, 1981
4210208 Subsea choke and riser pressure equalization system Jul. 1, 1980
4184545 Measuring and transmitting apparatus for use in a drill string Jan. 22, 1980
4147222 Acoustical underwater communication system for command control and data Apr. 3, 1979
4110688 Method and apparatus for pipe joint locator, counter and displacement calculator Aug. 29, 1978
4091881 Artificial lift system for marine drilling riser May. 30, 1978
4078620 Method of and apparatus for telemetering information from a point in a well borehole to the earth's surface Mar. 14, 1978
4063602 Drilling fluid diverter system Dec. 20, 1977
4040666 Apparatus and method of shield excavation Aug. 9, 1977
3976148 Method and apparatus for determining onboard a heaving vessel the flow rate of drilling fluid flowing out of a wellhole and into a telescoping marine riser connecting between the wellhouse and Aug. 24, 1976
3970877 Power generation in underground drilling operations Jul. 20, 1976
3968844 Determining the extent of entry of fluids into a borehole during drilling Jul. 13, 1976
3967680 Method and apparatus for actuating a downhole device carried by a pipe string Jul. 6, 1976
3961308 Oil and gas well disaster valve control system Jun. 1, 1976
3955411 Method for measuring the vertical height and/or density of drilling fluid columns May. 11, 1976
3946605 Apparatus and method of measuring fluctuations of excavated mud amount in a slurry line Mar. 30, 1976
3942594 Drill pipe monitoring system Mar. 9, 1976

1 2 3 4 5 6

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