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Class Information
Number: 33/544
Name: Geometrical instruments > Gauge > Internal > Earth cavity or tube
Description: Subject matter wherein the passageway or cavity is a pipe, casing, or hole in the earth.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7409774 |
Borehole tool |
Aug. 12, 2008 |
| 7360315 |
Poured concrete column alignment and plumbing tool |
Apr. 22, 2008 |
| 7347003 |
Device to measure axial displacement in a borehole |
Mar. 25, 2008 |
| 7301609 |
Measuring sonde for a hydrocarbon well |
Nov. 27, 2007 |
| 7131210 |
Borehole caliper tool |
Nov. 7, 2006 |
| 7000328 |
Surveyor's tool |
Feb. 21, 2006 |
| 6931748 |
Riser and tubular inspection systems |
Aug. 23, 2005 |
| 6895681 |
Method and instrument for measuring inside diameter of conduit |
May. 24, 2005 |
| 6877241 |
Measurement of curvature of a subsurface borehole, and use of such measurement in directional drilling |
Apr. 12, 2005 |
| 6848189 |
Method and apparatus for measuring a distance |
Feb. 1, 2005 |
| 6833706 |
Hole displacement measuring system and method using a magnetic field |
Dec. 21, 2004 |
| 6647637 |
Use of magneto-resistive sensors for borehole logging |
Nov. 18, 2003 |
| 6560889 |
Use of magneto-resistive sensors for borehole logging |
May. 13, 2003 |
| 6388439 |
Method and device for measuring in situ the gap between two given elements in a tubular pipe |
May. 14, 2002 |
| 6338202 |
Measurement tool used with an indicator |
Jan. 15, 2002 |
| 6151961 |
Downhole depth correlation |
Nov. 28, 2000 |
| 6065219 |
Method and apparatus for determining the shape of an earth borehole and the motion of a tool within the borehole |
May. 23, 2000 |
| 6065218 |
Method and apparatus for logging non-circular boreholes |
May. 23, 2000 |
| 6041509 |
Method and device for determining a space position of the axis of a cased well |
Mar. 28, 2000 |
| 5799407 |
Flexible measuring device |
Sep. 1, 1998 |
| 5729906 |
Hole diameter inspection |
Mar. 24, 1998 |
| 5727327 |
Centering method and apparatus |
Mar. 17, 1998 |
| 5640780 |
Moving device for intervening inside small-diameter pipework |
Jun. 24, 1997 |
| 5629480 |
Rock extensometer |
May. 13, 1997 |
| 5585555 |
Borehole strainmeter |
Dec. 17, 1996 |
| 5565624 |
Method of determining variations in the morphology of a borehole |
Oct. 15, 1996 |
| 5548900 |
Measuring instruments |
Aug. 27, 1996 |
| 5299359 |
Method and system for measurement of internal tube dimensions within a wellbore |
Apr. 5, 1994 |
| 5224274 |
Contact gage |
Jul. 6, 1993 |
| 5205048 |
Pipeline bend detector pig |
Apr. 27, 1993 |
| 5193289 |
Apparatus for measuring the thickness of thin layers |
Mar. 16, 1993 |
| 5157845 |
Device for checking linear dimensions of parts |
Oct. 27, 1992 |
| 5155920 |
Device for detecting the end of a sleeve arranged in a tube, and tool holder having such a device |
Oct. 20, 1992 |
| 5092056 |
Reversed leaf spring energizing system for wellbore caliper arms |
Mar. 3, 1992 |
| 5088336 |
Pipeline caliper pig |
Feb. 18, 1992 |
| 5040305 |
Apparatus for linear measurements |
Aug. 20, 1991 |
| 5038600 |
Gage and method for measuring the X-dimension of hydraulic tube fittings |
Aug. 13, 1991 |
| 4982505 |
Gauge for measuring both the depth and the diameter of a bore hole |
Jan. 8, 1991 |
| 4957374 |
Tunnel furnace height detector |
Sep. 18, 1990 |
| 4953412 |
Pipeline caliper pig |
Sep. 4, 1990 |
| 4914826 |
Decentralized well logging apparatus for measuring the diameters of a borehole along its perpendicular diametrical axes |
Apr. 10, 1990 |
| 4910877 |
Tube curvature measuring probe and method |
Mar. 27, 1990 |
| 4872269 |
Automatic cylinder profiling gage |
Oct. 10, 1989 |
| 4858329 |
A surveying and mapping apparatus for indicating the level differences of the ground travelled in relation to the distance travelled |
Aug. 22, 1989 |
| 4852262 |
Gauge for in situ measurement of borehole diameter |
Aug. 1, 1989 |
| 4843722 |
Self-centering bore hole gage |
Jul. 4, 1989 |
| 4747317 |
System for surveying fluid transmission pipelines and the like |
May. 31, 1988 |
| 4722142 |
Coating thickness gauge |
Feb. 2, 1988 |
| 4715128 |
Curvature probe and method |
Dec. 29, 1987 |
| 4702010 |
Testing the internal geometry of tubes and pipes |
Oct. 27, 1987 |
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