Issued Patents All Time
Showing 51–75 of 77 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6329916 | Magnetic marker or tag | — | 2001-12-11 |
| 6323769 | Apparatus for interrogating a magnetically coded tag | — | 2001-11-27 |
| 6323770 | Apparatus for interrogating a magnetically coded tag | — | 2001-11-27 |
| 6310309 | Methods of analysis/separation | Colin D. Ager, Duncan Ross Purvis, Nicholas A. Safford | 2001-10-30 |
| 6304014 | Motor control system | James M. C. England, David Ely, Malcolm C. Burwell, Geoffrey Foote | 2001-10-16 |
| 6249234 | Position detector | David Ely, Ross Peter Jones, James M. C. England, Alexander W. McKinnon, Robert M. Pettigrew +1 more | 2001-06-19 |
| 6230972 | Magnetic reading devices | Michael D. Crossfield, Alexander W. McKinnon | 2001-05-15 |
| 6144300 | Spatial magnetic interrogation | — | 2000-11-07 |
| H1875 | Electroacoustic transducer | — | 2000-10-03 |
| 6124708 | Position detection using a spaced apart array of magnetic field generators and plural sensing loop circuits offset from one another in the measurement direction | — | 2000-09-26 |
| 6118271 | Position encoder using saturable reactor interacting with magnetic fields varying with time and with position | David Ely, Edward Colby | 2000-09-12 |
| 6076007 | Surgical devices and their location | Mark England, Michael D. Crossfield | 2000-06-13 |
| 6059950 | Travelling wave particle separation apparatus | Nicholas A. Safford | 2000-05-09 |
| 6054924 | Magnetic markers | Michael D. Crossfield | 2000-04-25 |
| 5815091 | Position encoder | David Ely, Andrew Howe | 1998-09-29 |
| 5796250 | Plural rotary member position encoder having electromagnetically coupled resonant frequency multiplexed outputs for respectively associated rotatable members | — | 1998-08-18 |
| 5697649 | Articles employing a magnetic security feature | Geraint Davies, Alaric Naiman | 1997-12-16 |
| 5689263 | Antipilferage markers | — | 1997-11-18 |
| 5639126 | Machine readable and visually verifiable security threads and security papers employing same | Geraint Davies, Alaric Naiman | 1997-06-17 |
| 5621316 | Apparatus for measuring the positions of plural movable members each associated with a respective magnetorestrictive element | Peter HYDE | 1997-04-15 |
| 5614824 | Harmonic-based verifier device for a magnetic security thread having linear and non-linear ferromagnetic characteristics | David Ely, Colin D. Ager | 1997-03-25 |
| 5459451 | Electronic article surveillance system with enhanced geometric arrangement | Michael D. Crossfield | 1995-10-17 |
| 5420569 | Remotely readable data storage devices and apparatus | Peter HYDE | 1995-05-30 |
| 5414410 | Method and system for detecting a marker | Daffyd G. Davies, Michael D. Crossfield | 1995-05-09 |
| 5386714 | Resonant cavity gas density sensor | — | 1995-02-07 |