Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9800956 | Regional independent tandem telephone switch | Christopher Sayer, Richard Dean Terpstra | 2017-10-24 |
| 9634941 | Regional independent tandem telephone switch | Christopher Sayer, Richard Dean Terpstra | 2017-04-25 |
| 9197948 | Regional independent tandem telephone switch | Christopher Sayer, Richard Dean Terpstra | 2015-11-24 |