| 6047063 |
Methods and apparatus for providing an auxiliary communication line |
— |
2000-04-04 |
| 5557669 |
Channel interface unit |
James P. Hogan |
1996-09-17 |
| 5557670 |
Channel interface unit |
James P. Hogan |
1996-09-17 |
| 5557672 |
Channel interface unit |
James P. Hogan |
1996-09-17 |
| 5086459 |
Timing circuit and a secure telephone jack utilizing this circuit |
— |
1992-02-04 |
| 4807277 |
Remotely activated switching apparatus |
— |
1989-02-21 |
| 4796290 |
Ground start circuit |
— |
1989-01-03 |
| 4761810 |
Programmable selective ringing circuit and method for party telephone line |
— |
1988-08-02 |
| 4701949 |
Frequency responsive party telephone line selection apparatus and method |
Daniel Lynch |
1987-10-20 |
| 4686700 |
Telephone off-hook detector circuit |
— |
1987-08-11 |
| 4679224 |
Telephone line testing circuit |
Daniel Lynch |
1987-07-07 |
| 4624294 |
Wood thickness attachment |
Charles A. Robinson, George Spector |
1986-11-25 |
| D282654 |
Network interface enclosure |
Thomas J. Collins |
1986-02-18 |
| 4558182 |
Remotely-activated switching apparatus |
Joseph John Miller, Jr. |
1985-12-10 |
| 4550225 |
AC Signal-activated switching apparatus |
Daniel Lynch |
1985-10-29 |
| 4536617 |
Remotely-activated switching apparatus |
— |
1985-08-20 |