Video Research Ltd.
6Patents
0Active
6Granted
29Portfolio score
Filing activity: Apr 20, 1984 → Mar 19, 1998
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4905080A | Apparatus for collecting television channel data and market research data | Emerging Cross-Sectional Technologies | 163 | Expired |
| US4574304A | Audience rating measuring system for television and video tape recorder | Electricity | 114 | Expired |
| US4622583A | Audience rating measuring system | Electricity | 77 | Expired |
| US6388712B1 | System for verifying broadcast of a commercial message | Electricity | 62 | Expired |
| US4792864A | Apparatus for detecting recorded data in a video tape recorder for audience rating purposes | Physics | 46 | Expired |
| US5091877A | Data processing apparatus | Electricity | 21 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.