Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6724851 | FIR chip for use in a wireless subscriber unit | David N. Critchlow, Graham M. Avis, Wade L. Heimbigner, Karle J. Johnson, George Alan Wiley | 2004-04-20 |
| 6587516 | Subscriber unit producing a modulated digital frequency | David N. Critchlow, Graham M. Avis, Wade L. Heimbigner, Karle J. Johnson, George Alan Wiley | 2003-07-01 |
| 6449317 | Digital synthesizer | David N. Critchlow, Graham M. Avis, Wade L. Heimbigner, Karle J. Johnson, George Alan Wiley | 2002-09-10 |
| 6078629 | Digital synthesizer | David N. Critchlow, Graham M. Avis, Wade L. Heimbigner, Karle J. Johnson, George Alan Wiley | 2000-06-20 |
| 5943623 | Integrated control and signal processing in a cellular telephone | Graham Avis, John Ratzel | 1999-08-24 |
| 5859883 | Subscriber unit for wireless digital subscriber communication system | David N. Critchlow, Graham M. Avis, Wade L. Heimbigner, Karle J. Johnson, George Alan Wiley | 1999-01-12 |
| 5842137 | Subscriber unit for wireless digital telephone system | David N. Critchlow, Graham M. Avis, Sandra J. K. Earlam, Karle J. Johnson, Bruce A. Smetana +2 more | 1998-11-24 |
| 5694430 | Subscriber unit for wireless digital subscriber communication system | David N. Critchlow, Graham M. Avis, Wade L. Heimbigner, Karle J. Johnson, George Alan Wiley | 1997-12-02 |
| 5504800 | Cellular automated test set | Nancy Neigus, Phil Labarbera | 1996-04-02 |
| 5369671 | System and method for decoding tail-biting code especially applicable to digital cellular base stations and mobile units | John L. Watson, Michael Parr | 1994-11-29 |
| 5325396 | Subscriber unit for wireless digital subscriber communication system | David N. Critchlow, Graham M. Avis, Wade L. Heimbigner, Karle J. Johnson, George Alan Wiley | 1994-06-28 |
| 5177741 | Subscriber unit for wireless digital telephone system | David N. Critchlow, Graham Avis, Sandra J. K. Earlam, Karle J. Johnson, Bruce A. Smetana +2 more | 1993-01-05 |
| 5168507 | Automatic adaptive equalizer | David N. Critchlow, Graham M. Avis, Sandra J. K. Earlam, Karle J. Johnson, Bruce A. Smetana +2 more | 1992-12-01 |
| 5146473 | Subscriber unit for wireless digital subscriber communication system | David N. Critchlow, Graham M. Avis, Wade L. Heimbigner, Karle J. Johnson | 1992-09-08 |
| 5101418 | Digital time-multiplexed quadrature frequency upconverter | David N. Critchlow, Graham M. Avis, Sandra J. K. Earlam, Karle J. Johnson, Bruce A. Smetana +2 more | 1992-03-31 |
| 5067141 | Interpolator for varying a signal sampling rate | David N. Critchlow, Graham M. Avis, Sandra J. K. Earlam, Karle J. Johnson, Bruce A. Smetana +2 more | 1991-11-19 |
| 5008900 | Subscriber unit for wireless digital subscriber communication system | David N. Critchlow, Graham M. Avis, Wade L. Heimbigner, Karle J. Johnson, George Alan Wiley | 1991-04-16 |
| 4996697 | Deglitching means for digital communication systems | David N. Critchlow, Graham M. Avis, Sandra J. K. Earlam, Karle J. Johnson, Bruce A. Smetana +2 more | 1991-02-26 |
| 4994802 | Subscriber unit for wireless digital telephone system | David N. Critchlow, Graham M. Avis, Sandra J. K. Earlam, Karle J. Johnson, Bruce A. Smetana +2 more | 1991-02-19 |
| 4893317 | Digital signals and frequency correction in a digital wireless system | David N. Critchlow, Graham M. Avis, Sandra J. K. Earlam, Karle J. Johnson, Bruce A. Smetana +2 more | 1990-01-09 |
| 4881240 | AM equalizer circuit for digital systems | David N. Critchlow, Graham M. Avis, Sandra J. K. Earlam, Karle J. Johnson, Bruce A. Smetana +2 more | 1989-11-14 |
| 4764940 | Modem for RF subscriber telephone system | Eric Paneth, David N. Critchlow | 1988-08-16 |
| 4644561 | Modem for RF subscriber telephone system | Eric Paneth, David N. Critchlow | 1987-02-17 |