Assignee
NORTHERN DIGITAL INC
40 granted patents·15 pending applications·2,186 citations·filing 1996–2025
Top patents by PatentIndex Score
55 records- 0195US6061644ASystem for determining the spatial position and orientation of a bodyNORTHERN DIGITAL INC·Filed 1997·Granted May 9, 2000·471 cites·12 claims
- 0295US5828770ASystem for determining the spatial position and angular orientation of an objectNORTHERN DIGITAL INC·Filed 1996·Granted Oct 27, 1998·660 cites·10 claims
- 0393US7137712B2Reflector system for determining positionNORTHERN DIGITAL INC·Filed 2000·Granted Nov 21, 2006·74 cites·15 claims
- 0492US7353125B2Eddy current detection and compensationNORTHERN DIGITAL INC·Filed 2006·Granted Apr 1, 2008·106 cites·15 claims
- 0590US12324633B2Electromagnetic sensorNORTHERN DIGITAL INC·Filed 2023·Granted Jun 10, 2025·1 cites·25 claims
- 0690US7945311B2Retroreflective marker-tracking systemsNORTHERN DIGITAL INC·Filed 2007·Granted May 17, 2011·48 cites·43 claims
- 0789US6990427B2Gain factor and position determination systemNORTHERN DIGITAL INC·Filed 2003·Granted Jan 24, 2006·71 cites·22 claims
- 0888US12078825B1Textured retro-reflective markerNORTHERN DIGITAL INC·Filed 2023·Granted Sep 3, 2024·1 cites·30 claims
- 0987US12039751B2Error compensation for a three-dimensional tracking systemNORTHERN DIGITAL INC·Filed 2021·Granted Jul 16, 2024·3 cites·20 claims
- 1086US5923417ASystem for determining the spatial position of a targetNORTHERN DIGITAL INC·Filed 1997·Granted Jul 13, 1999·146 cites·10 claims
- 1185US7957925B2Eddy current detection and compensationNORTHERN DIGITAL INC·Filed 2010·Granted Jun 7, 2011·18 cites·34 claims
- 1282US2026079288A1Retro-reflective disc target having exposed retro-reflective beadsNORTHERN DIGITAL INC·Filed 2025·Application pending·0 cites
- 1379US12274515B2Electromagnetic position measurement system with sensor parasitic loop compensationNORTHERN DIGITAL INC·Filed 2023·Granted Apr 15, 2025·0 cites·19 claims
- 1479US11076511B2Self-contained electromagnetic tracking unitNORTHERN DIGITAL INC·Filed 2019·Granted Jul 27, 2021·3 cites·13 claims
- 1578US12271009B2Retro-reflective marker with uniformly distributed microelementsNORTHERN DIGITAL INC·Filed 2024·Granted Apr 8, 2025·0 cites·30 claims
- 1678US7469187B2Eddy current detection and compensationNORTHERN DIGITAL INC·Filed 2006·Granted Dec 23, 2008·14 cites·16 claims
- 1778US6553326B1Errors in systems using magnetic fields to locate objectsNORTHERN DIGITAL INC·Filed 2000·Granted Apr 22, 2003·106 cites·27 claims
- 1878US2024411065A1Textured retro-reflective markerNORTHERN DIGITAL INC·Filed 2024·Application pending·0 cites
- 1977US12313867B1Textured retro-reflective markerNORTHERN DIGITAL INC·Filed 2024·Granted May 27, 2025·0 cites·20 claims
- 2076US6625563B2Gain factor and position determination systemNORTHERN DIGITAL INC·Filed 2001·Granted Sep 23, 2003·87 cites·42 claims
- 2175US2025362436A1Textured retro-reflective markerNORTHERN DIGITAL INC·Filed 2025·Application pending·0 cites
- 2274US2025082221A1Electromagnetic tracking and position measurement system having interference reduction from nearby instrumentation by filtering time-division multiplexed signal via step functionNORTHERN DIGITAL INC·Filed 2024·Application pending·0 cites
- 2373US11529193B2Tracking a sensor that includes a ferrofluidNORTHERN DIGITAL INC·Filed 2018·Granted Dec 20, 2022·1 cites·18 claims
- 2472US10539644B1Tracking an object in an electromagnetic fieldNORTHERN DIGITAL INC·Filed 2019·Granted Jan 21, 2020·6 cites·22 claims
- 2572US2025275811A1Electromagnetic sensorNORTHERN DIGITAL INC·Filed 2025·Application pending·0 cites
- 2671US2025258324A1Retro-reflective marker with uniformly distributed microelementsNORTHERN DIGITAL INC·Filed 2025·Application pending·0 cites
- 2770US10779892B2Tracking a cylindrical openingNORTHERN DIGITAL INC·Filed 2018·Granted Sep 22, 2020·2 cites·21 claims
- 2869US7783441B2Eddy current detection and compensationNORTHERN DIGITAL INC·Filed 2004·Granted Aug 24, 2010·38 cites·17 claims
- 2968US12498509B2Retro-reflective disc target having exposed retro-reflective beadsNORTHERN DIGITAL INC·Filed 2022·Granted Dec 16, 2025·0 cites·27 claims
- 3068US7194296B2Flexible instrument with optical sensorsNORTHERN DIGITAL INC·Filed 2001·Granted Mar 20, 2007·62 cites·19 claims
- 3167US6836745B2Method for determining the position of a sensor elementNORTHERN DIGITAL INC·Filed 2001·Granted Dec 28, 2004·55 cites·10 claims
- 3267US6288785B1System for determining spatial position and/or orientation of one or more objectsNORTHERN DIGITAL INC·Filed 1999·Granted Sep 11, 2001·166 cites·21 claims
- 3366US7204796B1Device for determining the position of body parts and use of the sameNORTHERN DIGITAL INC·Filed 2000·Granted Apr 17, 2007·47 cites·17 claims
- 3466US2024247955A1Reconfigurable transmitter array for electromagnetic tracking systemsNORTHERN DIGITAL INC·Filed 2024·Application pending·0 cites
- 3565US12257005B2Tracking a sensor that includes a ferrofluidNORTHERN DIGITAL INC·Filed 2022·Granted Mar 25, 2025·0 cites·19 claims
- 3665US12178564B2Electromagnetic tracking and position measurement system having interference reduction from nearby instrumentation by filtering time-division multiplexed signal via step functionNORTHERN DIGITAL INC·Filed 2022·Granted Dec 31, 2024·0 cites·21 claims
- 3765US11612086B2Self-contained electromagnetic tracking unitNORTHERN DIGITAL INC·Filed 2021·Granted Mar 21, 2023·0 cites·20 claims
- 3863US11340311B2Determining position and orientation from a Helmholtz deviceNORTHERN DIGITAL INC·Filed 2020·Granted May 24, 2022·0 cites·21 claims
- 3961US2024148466A1Optical Fiber Shape SensingNORTHERN DIGITAL INC·Filed 2023·Application pending·0 cites
- 4059US2024273734A1Marker and markerless trackingNORTHERN DIGITAL INC·Filed 2024·Application pending·0 cites
- 4158US12582329B2Magneto-mechanical capsulesNORTHERN DIGITAL INC·Filed 2024·Granted Mar 24, 2026·0 cites·18 claims
- 4258US12569311B2Fiber optic shape sensing managementNORTHERN DIGITAL INC·Filed 2024·Granted Mar 10, 2026·0 cites·30 claims
- 4355US11953349B2Reconfigurable transmitter array for electromagnetic tracking systemsNORTHERN DIGITAL INC·Filed 2020·Granted Apr 9, 2024·0 cites·22 claims
- 4455US11604057B2Calibrating a magnetic transmitterNORTHERN DIGITAL INC·Filed 2020·Granted Mar 14, 2023·0 cites·14 claims
- 4552US2024330663A1Distortion compensation systemNORTHERN DIGITAL INC·Filed 2024·Application pending·0 cites
- 4650US12544150B2Field generator orientation for magnetic tracking in planar field generating assembliesNORTHERN DIGITAL INC·Filed 2023·Granted Feb 10, 2026·0 cites·20 claims
- 4749US11397220B2Distortion correction for tracking an object in a magnetic fieldNORTHERN DIGITAL INC·Filed 2020·Granted Jul 26, 2022·0 cites·17 claims
- 4849US11360161B2Compensating for distortion in an electromagnetic tracking systemNORTHERN DIGITAL INC·Filed 2019·Granted Jun 14, 2022·0 cites·25 claims
- 4946US2025352274A1Tracking and maneuvering using an electromagnetic sensorNORTHERN DIGITAL INC·Filed 2025·Application pending·0 cites
- 5045US2023036150A1Tracking SystemNORTHERN DIGITAL INC·Filed 2022·Application pending·0 cites
Showing the top 50 of 55 patent records by PatentIndex Score.
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