Issued Patents All Time
Showing 1–25 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7368831 | Power converter feedback circuit | — | 2008-05-06 |
| 6597157 | Parallel phased switch control | Stewart Glenn Carlton | 2003-07-22 |
| 6184666 | Buck converter with parallel switches | Wolfgang Dietz | 2001-02-06 |
| 5852372 | Apparatus and method for signal handling on GTL-type buses | Vern Brethour, Vahid Samiee | 1998-12-22 |
| 4719648 | Coin relay drive and switching circuit for paystation telephone instruments | — | 1988-01-12 |
| 4718083 | Differential receive booster amplifier for telephone instruments | — | 1988-01-05 |
| 4680783 | Telephone security violation detection device | — | 1987-07-14 |
| 4675902 | High performance telephone instrument with combination pulse and tone dialing capacity | — | 1987-06-23 |
| 4672664 | Telephone line monitor amplifier | — | 1987-06-09 |
| 4648109 | Light emitting diode message waiting lamp circuit | — | 1987-03-03 |
| 4634959 | Temperature compensated reference circuit | — | 1987-01-06 |
| 4625128 | Integrated circuit temperature sensor | — | 1986-11-25 |
| 4623762 | Static discharge snubber circuit for silicon controlled rectifier (SCR) type telephone hold devices | Miranda L. James | 1986-11-18 |
| 4600876 | Integrated bootstrap bias circuit | — | 1986-07-15 |
| 4591666 | Protection circuitry for subscriber's telephone circuit equipped with repertory memory | — | 1986-05-27 |
| 4555597 | Transient resistant key operated pulse generating calling device circuit | Larry A. Woodworth | 1985-11-26 |
| 4529843 | Subscribers telephone hold circuit with automatic disconnect | — | 1985-07-16 |
| 4529845 | Optical coupling interface circuit for telephone line ringing signal indication or detection | — | 1985-07-16 |
| 4523057 | High gain cascode amplifier with negative feedback | — | 1985-06-11 |
| 4518829 | Two terminal microphone active load gain regulation circuit | — | 1985-05-21 |
| 4517414 | Hookswitch bounce resistant telephone hold-mute circuit | — | 1985-05-14 |
| 4454385 | Latching relay hold release circuit for a telephone instrument | Gary Grantland | 1984-06-12 |
| 4451706 | Telephone substation transmitter muting circuit | — | 1984-05-29 |
| 4447674 | Electronic hold release circuit | Gary Grantland, Hugh S. Montgomery, Larry A. Woodworth | 1984-05-08 |
| 4440981 | Electronic hold circuit | Gary Grantland, Hugh S. Montgomery, Larry A. Woodworth | 1984-04-03 |