Quotables
"It is my heart-warmed and world-embracing Christmas hope and aspiration that all of us, the high, the low, the rich, the poor, the admired, the despised, the loved, the hated, the civilized, the savage (every man and brother of us all throughout the whole earth), may eventually be gathered together in a heaven of everlasting rest and peace and bliss, except the inventor of the telephone. "
Mark Twain ; Christmas greetings, 1890
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US Patent 4945305 - Device for quantitatively measuring the relative position and orientation of two bodies in the presence of metals utilizing direct current magnetic fields
US Patent Issued on July 31, 1990
Estimated Patent Expiration Date:
April 11, 2009Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
April 11, 2009Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA device for measuring the position (location and orientation), in the six degrees of freedom of receiving antennae (3) with respect to transmitting antennae (2) utilizing pulsed DC magnetic signals. The transmitting and receiving components consist of two or more transmitting antennae of known location and orientation with respect to each other. The transmitting antenna (2) are driven one at a time (or in the case of three or more antennae one or two at a time) by a pulsed, direct current signal. The receiving antennae (3) measure the transmitted direct current magnetic fields and the earth's magnetic field. A computer (5) is used to control the transmitting and receiving elements and to convert the received signals into location and orientation outputs. | InventorAssigneeApplicationNo. 336342 filed on 04/11/1989US Classes:324/207.17, Separate pick-up324/207.11, Displacement324/207.15, Inductive324/207.26, Approach or retreat342/451By computerField of Search324/235, Noncoil type324/247, Nonparallel plural magnetic sensors342/450, Position indicating (e.g., triangulation)342/451, By computer342/452, By plotting table342/453By deflected or repeated signalExaminersPrimary: Eisenzopf, Reinhard J.Assistant: Snow, Walter E. Attorney, Agent or FirmUS Patent References3121228, 3133283, 4560930, Distance-measuring system using orthogonal magnetic field generators and orthogonal magnetic field sensorsIssued on: 12/24/1985 Inventor: Kouno4613866, Three dimensional digitizer with electromagnetic coupling Issued on: 09/23/1986 Inventor: Blood4849692Device for quantitatively measuring the relative position and orientation of two bodies in the presence of metals utilizing direct current magnetic fields Issued on: 07/18/1989 Inventor: Blood International ClassesG01B 007/14G01S 005/04 |
