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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 7372040 | Neutron detector with layered thermal-neutron scintillator and dual function light guide and thermalizing media A broad spectrum neutron detector has a thermal neutron sensitive scintillator film interleaved with a hydrogenous thermalizing media. The neutron detector has negligible sensitivity to gamma rays and produces a strong and unambiguous signal for virtually all neutro... | 05/13/2008 |
| 7339161 | Shielded pads for detecting subsurface radiation phenomena Apparatus and method for detecting subsurface radiation phenomena. An elongated support member, adapted for disposal within a wellbore traversing a subsurface formation, includes a recess along its longitudinal axis. A pad is linked to the support member. The pad is... | 03/04/2008 |
| 7285772 | Logging tool with a parasitic radiation shield and method of logging with such a tool It is described a logging tool 20 for underground formations surrounding a borehole 14, comprising an elongated body 21 along a major axis; a collar 22 disposed peripherally around said body 21 having a collar wall defined by an in... | 10/23/2007 |
| 7234556 | One-touch cruise control system A vehicle cruise control system comprises a plurality of pre-set cruise control speed buttons and cruise control logic circuitry coupled to the pre-set cruise control speed buttons. Each one of the pre-set cruise control speed buttons corresponds to a respective pre... | 06/26/2007 |
| 7231077 | Device and method for forming an image composed of a plurality of sub-areas The invention relates to a method of and a device for forming an image which is composed of a plurality of sub-areas, a read-out unit being associated with each sub-area and image data of adjoining image areas of neighboring sub-areas being evaluated in order to mit... | 06/12/2007 |
| 7202478 | Gamma-ray spectrometry A scintillation spectrometer provides improved resolution by ensuring that photons generated by scintillation events occurring in different locations within the scintillation material generate similar light profiles on the photo-detector, thereby making the output s... | 04/10/2007 |
| 7139350 | Method and apparatus for measuring radiation in a borehole Apparatus and methods for measuring radiation in a borehole environment using a YAlO3:Ce (YAP) scintillation crystal. Borehole instruments are disclosed which employ a gamma ray detector comprising a YAP scintillator coupled to a light sensing means such ... | 11/21/2006 |
| 7069775 | Borehole caliper tool using ultrasonic transducer A borehole caliper tool includes a tool body, a bow spring flexibly coupled to the tool body, a target coupled to the bow spring, and an ultrasonic transducer coupled to the tool body, wherein in operation the ultrasonic transducer transmits an acoustic pulse to the... | 07/04/2006 |
| 7009162 | Photomultiplier power supply with primary and secondary transformer windings A method and apparatus for providing a photomultiplier power supply having a transformer with multiple secondary windings forming cells that can provide voltage ratios to a photomultiplier element in which the ratios can be adjusted by the method of connection to th... | 03/07/2006 |
| 6999609 | Device and method for forming an image composed of a plurality of sub-areas The invention relates to a method of and a device for forming an image which is composed of a plurality of sub-areas, a read-out unit being associated with each sub-area and image data of adjoining image areas of neighboring sub-areas being evaluated in order to mit... | 02/14/2006 |
| 6918293 | System and method having radiation intensity measurements with standoff correction We disclose density measurement methods that are accurate over an extended range of standoff distances. One method embodiment includes: a) obtaining a standoff distance, a near detector count rate, and a far detector count rate; b) determining a formation density me... | 07/19/2005 |
| 6891194 | Active matrix substrate, electromagnetic detector, and liquid crystal display apparatus An electromagnetic detector includes an insulating substrate, whereon a charge storage capacitor, a charge collection electrode connected to the charge storage capacitor, and a semiconductor film having electromagnetic conductivity are laminated in this order. The c... | 05/10/2005 |
| 6100530 | Angular time synchronized directional radiation sensor An angular time-synchronized directional radiation sensor is provided to indicate the direction, or distribution of directions, of incident gamma radiation, and consequently, to locate sources of radioactivity emitting these photons. The angular time-sync... | 08/08/2000 |
| 5910654 | Apparatus and method for measuring formation density in rugose boreholes A method/apparatus for determining the density of a formation traversed by a borehole having irregularities along the borehole wall preferably employs/includes a housing, a photon source, and a detector. The source preferably includes an irradiation path ... | 06/08/1999 |
| 5321982 | Method for measuring the rate of penetration of an equipment progressing in a well The method comprises using a transmitting unit and at least two receiving units (8,10) arranged in two different places along well equipment (2). Each receiving unit forms an image or signature of wall portions which pass it. The signatures of wall portio... | 06/21/1994 |
| 5205167 | Method and apparatus for locating stratification in production fluid in a well Apparatus for measuring the volume of gas present in a multiphase flow regime in a cased oil or gas well borehole and the amount, if any, of stratification thereof at a particular borehole depth. The apparatus includes a low energy gamma ray source and a ... | 04/27/1993 |
| 5153431 | Well logging radioactive detector assembly A radioactive energy detector for well logging utilizes a Dewar flask. The Dewar flask has an inner housing containing a gamma ray detector. An outer housing surrounds the inner housing, with the annular clearance being evacuated. A window section is inte... | 10/06/1992 |
| 5045693 | Carbon/oxygen well logging method and apparatus A nuclear spectroscopic method and apparatus for determining hydrocarbon saturation or water saturation of a formation adjacent a well bore is disclosed. Near and far inelastic gamma ray spectra are detected in response to pulses of fast neutrons irradiat... | 09/03/1991 |
| 5021652 | Directional gamma ray spectrometer This disclosure is directed to a scintillation crystal surrounded by a sleeve and having a window formed therein. The scintillation crystal has end located first and second photomultiplier tubes which provide output signals. A scintillation event observed... | 06/04/1991 |
| 4972082 | Methods and apparatus for epithermal neutron logging The porosity of an earth formation is derived in a plused neutron logging tool by use of a directionalized and borehole-shielded eptithermal neutron detector array and by processing detector count rate measurements of the epithermal neutron die-away curve... | 11/20/1990 |
| 4939362 | Borehole fluid density well logging means and method The present invention is a density meter which includes a well logging sonde that is inserted into a borehole traversing an earthen formation. The sonde includes within it a source which emits gamma rays into the borehole fluid and a detector assembly whi... | 07/03/1990 |
| 4937446 | Carbon/oxygen well logging method and apparatus A nuclear spectroscopic method and apparatus for determining hydrocarbon saturation or water saturation of a formation adjacent a well bore is disclosed. Near and far inelastic gamma ray spectra are detected in response to pulses of fast neutrons irradiat... | 06/26/1990 |
| 4931638 | Method of monitoring hidden coal-rock interface and transducer realizing this method A method for monitoring a hidden coal-rock interface, comprising the steps of irradiating the medium (M) being monitored from a gamma-ray source (1) and registering by a detector (2) the intensity of backward scattered radiation at a distance (A) from the... | 06/05/1990 |
| 4874951 | Solid-state track recorder dosimetry device to measure absolute reaction rates and neutron fluence as a function of time A solid state track recording type dosimeter is disclosed to measure the time dependence of the absolute fission rates of nuclides or neutron fluence over a period of time. In a primary species an inner recording drum is rotatably contained within an exte... | 10/17/1989 |
| 4760252 | Well logging tool with an accelerator neutron source In the illustrative embodiments of the invention disclosed, a neutron porosity well logging tool includes a D-T neutron accelerator, a fast-neutron monitor for monitoring accelerator output, near and far epithermal neutron detectors for deriving a primary... | 07/26/1988 |
| 4661700 | Well logging sonde with shielded collimated window A well logging sonde is disclosed which includes a collimating window design for the accurate detection of gamma rays of low and high energy which are back-scattered from a region near a source of gamma rays emitted into the formation. The sonde includes ... | 04/28/1987 |
| 4638159 | Graded shaped spatial resolution nuclear detectors For use in a sonde adapted to be lowered in a well bore, the present apparatus sets forth an improved nuclear event detector. The detector is sized and shaped monotonically increasing in cross section or diameter with increasing distance from the radiatio... | 01/20/1987 |
| 4629888 | Well logging tool for hot well bores Apparatus for insulating enclosed electronic devices against damaging temperatures when used in deep, hot well bores. Includes a first vacuum chamber insulating means defined by outer casing of well-logging tool and inner casing. First vacuum chamber defi... | 12/16/1986 |
| 4590370 | Epithermal neutron die-away logging A borehole logging tool includes a pulsed source of fast neutrons and a neutron sensitive counter. A neutron filter encases the counter and has a thickness to permit the longest possible delay time following each burst of fast neutrons before epithermal n... | 05/20/1986 |
| 4580049 | Probe for locating mineral deposits A cylindrical probe for insertion into a drill hole for detecting the presence of mineral deposits. A source of radioactive irradiation and a detector are mounted concentrically within the housing of the probe, the detector being shielded from direct radi... | 04/01/1986 |
| 4556793 | Epithermal neutron lifetime logging A radioactive borehole logging tool employs an epithermal neutron detector having a neutron counter surrounded by an inner thermal neutron filter and an outer thermal neutron filter. Located between the inner and outer thermal neutron filters is a neutron... | 12/03/1985 |
| 4503327 | Combination thermal and radiation shield A device for providing both thermal protection and radiation shielding for components within a well logging instrument. A thermally insulative flash contains a mass of eutectic material which undergoes a change of state at a temperature which will provide... | 03/05/1985 |
| 4228350 | Method and apparatus for measuring underground fluid flow characteristics An underground logging tool is equipped with a gamma ray detector encircled by a rotatable shield featuring a collimator slot. After the fluid in a formation is activated by a neutron source, the detector is used to obtain radiation count information as a... | 10/14/1980 |
| 4122341 | Cementing method to improve well logging measurements in cased well boreholes According to the method of the present invention a well cement having a high thermal neutron capture cross section is used when cementing the well casing in place. This, possibly together with the use of other high thermal neutron capture cross section ma... | 10/24/1978 |
| 4002903 | Simultaneous thermal neutron decay time and shale compensated chlorine log system Earth formations surrounding a well borehole are repetitively bombarded with bursts of high energy neutrons. A radiation detector in a sonde in the borehole senses the gamma rays induced by the capture of thermal neutrons and sends representative signals ... | 01/11/1977 |
| 3973131 | Pulsed neutron logging: multipurpose logging sonde for changing types of logs in the borehole without bringing the sonde to the surface Disclosed is a system for nuclear well logging in which neutron pulse time duration for a high energy neutron generator and the frequency of pulses are selected downhole in the tool by use of a coded signal transmitted by the cable from the earth's surfac... | 08/03/1976 |
