Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5737025 | Co-channel transmission of program signals and ancillary signals | Robert Dougherty, Daozheng Lu, Henry B. Wheeler | 1998-04-07 |
| 5662345 | Wheelchair wheel cambering apparatus | — | 1997-09-02 |
| 5331544 | Market research method and system for collecting retail store and shopper market research data | Daozheng Lu, Jia Zhang | 1994-07-19 |
| 5040409 | Sprinkler alarm | — | 1991-08-20 |
| 4930011 | Method and apparatus for identifying individual members of a marketing and viewing audience | — | 1990-05-29 |
| 4876736 | Method and apparatus for determining channel reception of a receiver | — | 1989-10-24 |
| 4697209 | Methods and apparatus for automatically identifying programs viewed or recorded | Daozheng Lu | 1987-09-29 |
| 4644509 | Ultrasonic audience measurement system and method | Daozheng Lu | 1987-02-17 |