Issued Patents All Time
Showing 25 most recent of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10474420 | Gesture-controlled tabletop speaker system | Manpreet S. Khaira, Shawn O'Connor, Frank Prestrelski, Richard Andrew Sorensen, Eric Sorensen | 2019-11-12 |
| 10198239 | Gesture-controlled tabletop speaker system | Manpreet S. Khaira, Shawn O'Connor, Frank Prestrelski, Richard Andrew Sorensen, Eric Sorensen | 2019-02-05 |
| 9661413 | Acoustic layer in media device providing enhanced audio performance | Robert C. Proebstel, Manpreet S. Khaira, Thomas Irrgang, Nigel Waites, Ian J. Myles | 2017-05-23 |
| 9645786 | Gesture-controlled tabletop speaker system | Manpreet S. Khaira, Shawn O'Connor, Frank Prestrelski, Richard Andrew Sorensen, Eric Sorensen | 2017-05-09 |
| 9204211 | Pad-type device case providing enhanced audio functionality and output | Robert C. Proebstel, Manpreet S. Kharia, Thomas Irrgang, Nigel Waites, Ian J. Myles | 2015-12-01 |
| 8228111 | Bias voltage generation for capacitor-coupled level shifter with supply voltage tracking and compensation for input duty-cycle variation | — | 2012-07-24 |
| 8207788 | Calibrated feedback | Wai Laing Lee, Garry N. Link, Adam C. Broun, Eric T. King | 2012-06-26 |
| RE42284 | Signaling techniques for DC track powered model railroads | Frederick E. Severson | 2011-04-12 |
| 7443200 | Capacitor-coupled level shifter with duty-cycle independence and supply referenced bias configuration | Wai Laing Lee | 2008-10-28 |
| 7433377 | Laser drive method and apparatus | Chung-Chieh Yu | 2008-10-07 |
| 7282954 | Capacitor-coupled level shifter with duty-cycle independence | — | 2007-10-16 |
| 6230140 | Continuous sound by concatenating selected digital sound segments | Frederick E. Severson | 2001-05-08 |
| 5940005 | Method and apparatus for storing and utilizing a unique power down state in a model railroad system | Frederick E. Severson | 1999-08-17 |
| 5896017 | Model train locomotive with doppler shifting of sound effects | Frederick E. Severson | 1999-04-20 |
| 5832431 | Non-looped continuous sound by random sequencing of digital sound records | Frederick E. Severson | 1998-11-03 |
| 5773939 | Command control for model railroading using AC track power signals for encoding pseudo-digital signals | Frederick E. Severson | 1998-06-30 |
| 5633985 | Method of generating continuous non-looped sound effects | Frederick E. Severson | 1997-05-27 |
| 5590856 | Complex switch turn-out arrangements using proximity selection | Frederick E. Severson | 1997-01-07 |
| 5492290 | Model railroad operation using proximity selection | Frederick E. Severson | 1996-02-20 |
| 5448142 | Signaling techniques for DC track powered model railroads | Frederick E. Severson | 1995-09-05 |
| 5394068 | Automatic initialization in a model railroad motor control system | Frederick E. Severson | 1995-02-28 |
| 5267318 | Model railroad cattle car sound effects | Frederick E. Severson | 1993-11-30 |
| 5247468 | System for calculating and displaying user-defined output parameters describing behavior of subcircuits of a simulated circuit | Dale K. Henrichs | 1993-09-21 |
| 5184048 | Model railroad reversing motor control system | Frederick E. Severson | 1993-02-02 |
| 4914431 | Electronic control system for model railroads | Frederick E. Severson | 1990-04-03 |