| 5374951 |
Method and system for monitoring television viewing |
— |
1994-12-20 |
| 4958371 |
Method and apparatus for determining when a telephone handset is off-hook |
Joseph A. Damoci, Matthew F. Kern, John D. Fourdraine |
1990-09-18 |
| 4955070 |
Apparatus and method for automatically monitoring broadcast band listening habits |
John D. Fourdraine |
1990-09-04 |
| 4857999 |
Video monitoring system |
— |
1989-08-15 |
| 4829558 |
System and device for data transmission, and related method |
— |
1989-05-09 |
| 4816904 |
Television and market research data collection system and method |
William J. McKenna, Kenneth W. Silvers, Rand B. Nickerson, Harold R. Walker, Joseph A. Cullity +1 more |
1989-03-28 |
| 4658290 |
Television and market research data collection system and method |
William J. McKenna, Kenneth W. Silvers, Rand B. Nickerson, Harold R. Walker, Joseph A. Cullity +1 more |
1987-04-14 |
| 4566030 |
Television viewer data collection system |
Rand B. Nickerson |
1986-01-21 |
| 4546382 |
Television and market research data collection system and method |
William J. McKenna, Kenneth W. Silvers, Rand B. Nickerson, Harold R. Walker, Joseph A. Cullity +1 more |
1985-10-08 |