Issued Patents All Time
Showing 26–50 of 52 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5533759 | Method of currency or document validation by use of a temperature sensitive magnetic pattern | — | 1996-07-09 |
| 5532584 | MR sensor including calibration circuit wherein signals are averaged for determining a correction factor and pole pieces are shaped to reduce field in gap therebetween | Neil Smith, Jay D. Freeman, Kent Gandola, Peter VanderSalm Koeppe | 1996-07-02 |
| 5418458 | Apparatus and method for authentication of documents printed with magnetic ink | — | 1995-05-23 |
| 5413903 | Element having a transparent magnetic recording layer containing barium ferrite particles | — | 1995-05-09 |
| 5398145 | Tracking control apparatus including a servo head having a tapered transducing gap | John Rolker | 1995-03-14 |
| 5353169 | Contact duplication of magnetically recorded information without the use of a transfer field | Charles F. Brucker | 1994-10-04 |
| 5315246 | Rotating source for generating a magnetic field for use with a currency detector | — | 1994-05-24 |
| 5260653 | Thin film very high sensitivity magnetoresistive magnetometer having temperature compensation and simple domain stability | Neil Smith, Jay D. Freeman | 1993-11-09 |
| 5239435 | Laminated magnetic record/playback head with thin films of high permeability material spaced apart by very thin films of insulating magnetic material for high bit densities and data transfer rates | Neil Smith | 1993-08-24 |
| 5218493 | Magnetic recording apparatus including a magnetic head having a curved media-contact surface equal to the curvature of a rotatable drum | — | 1993-06-08 |
| 5121258 | Apparatus for anhysteretic duplication of a flexible magnetic disk | Chao S. Chi, Richard J. McClure | 1992-06-09 |
| 5119025 | High-sensitivity magnetorresistive magnetometer having laminated flux collectors defining an open-loop flux-conducting path | Neil Smith | 1992-06-02 |
| 5025163 | Radiographic imaging screen | — | 1991-06-18 |
| 4992699 | X-ray phosphor imaging screen and method of making same | Richard J. McClure | 1991-02-12 |
| 4908724 | Dual gap cross-field magnetic recording head with single gap signal excitation | — | 1990-03-13 |
| 4754354 | Ferrite film insulating layer in a yoke-type magneto-resistive head | — | 1988-06-28 |
| 4748528 | Apparatus having a magnetic turnaround roller to reduce magnetostrictive knockdown | — | 1988-05-31 |
| 4714324 | Apparatus utilizing dispersion shear | Richard J. McClure | 1987-12-22 |
| 4683508 | Magneto-resistive head with reduced thermal noise | John L. Simonds | 1987-07-28 |
| 4642718 | Optimum control of overwrite by record gap length selection | David Wachenschwanz | 1987-02-10 |
| 4633344 | Unambiguously tracking a data track in response to signals derived from the track data itself | — | 1986-12-30 |
| 4414595 | Scanning magnetic head with propagating domain wall | — | 1983-11-08 |
| 4413296 | Thin film magnetoresistive head | — | 1983-11-01 |
| 4388662 | Thin film magnetoresistive head | Richard J. McClure | 1983-06-14 |
| 4318136 | Magnetic recording apparatus and method | — | 1982-03-02 |