| 5185781 |
Automation of telephone operator assistance calls |
Douglas C. Dowden, Richard W. Hemmeter, William K. McCormick, Robert Petrelli, Richard J. Piereth +3 more |
1993-02-09 |
| 5181237 |
Automation of telephone operator assistance calls |
Douglas C. Dowden, Richard W. Hemmeter, William K. McCormick, Robert Petrelli, Richard J. Piereth +3 more |
1993-01-19 |
| 5163083 |
Automation of telephone operator assistance calls |
Douglas C. Dowden, Richard W. Hemmeter, Richard J. Piereth, Samuel M. Salchenberger, Chander S. Sehgal +1 more |
1992-11-10 |
| 4544804 |
Conference control transfer arrangement |
Laddie E. Suk, David F. Winchell |
1985-10-01 |
| 4540850 |
Method and apparatus for controlling a conference |
Laddie E. Suk, David F. Winchell |
1985-09-10 |
| 4509167 |
Data conference arrangement |
Richard G. Bantel |
1985-04-02 |
| 4479195 |
Data conference system |
Reinhard Metz, Larry Arnise Russell |
1984-10-23 |
| 4475189 |
Automatic interactive conference arrangement |
Reinhard Metz, Laddie E. Suk, Paul Wiley, David F. Winchell |
1984-10-02 |