Issued Patents All Time
Showing 26–31 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5793521 | Differentially patterned pumped optical semiconductor gain media | Alexander Schoenfelder, Robert J. Lang, Amos A. Hardy, Ross A. Parke, David F. Welch | 1998-08-11 |
| 5479489 | Voice telephone dialing architecture | — | 1995-12-26 |
| 5349602 | Broad-area MOPA device with leaky waveguide beam expander | David G. Mehuys, David F. Welch | 1994-09-20 |
| 5255332 | NxN Optical crossbar switch matrix | David F. Welch, Donald R. Scifres, Robert G. Waarts, Amos A. Hardy, David G. Mehuys | 1993-10-19 |
| 5231642 | Semiconductor ring and folded cavity lasers | Donald R. Scifres, Kenneth M. Dzurko, Robert G. Waarts, David F. Welch, Amos A. Hardy | 1993-07-27 |
| 5155760 | Voice messaging system with voice activated prompt interrupt | Mark A. Johnson, Bradley Wyman | 1992-10-13 |