| 5812184 |
Transmission of frame-to-frame reversed polarity signals in a two-way cable TV conversion system |
— |
1998-09-22 |
| 5596361 |
Two-way cable TV conversion system for data transmission over a dedicated frequency band |
— |
1997-01-21 |
| 5589872 |
Compatible interactive TV and multimedia delivery system two-way cable TV conversion system for data transmission over a dedicated frequency band |
— |
1996-12-31 |
| 5550579 |
Two-way cable tv conversion system |
— |
1996-08-27 |
| 5404734 |
Secure locking arrangement |
— |
1995-04-11 |
| 5353833 |
Gate valve locking arrangement |
— |
1994-10-11 |
| 5321514 |
Interactive television and data transmission system |
— |
1994-06-14 |
| 5177604 |
Interactive television and data transmission system |
— |
1993-01-05 |
| 4928177 |
Two-way data broadcast networks |
— |
1990-05-22 |
| 4908600 |
Narrow band synchronized radio communication and alarm system |
— |
1990-03-13 |
| 4750036 |
Interactive television and data transmission system |
— |
1988-06-07 |
| 4651156 |
Integrated radio location and communication system |
— |
1987-03-17 |
| 4518822 |
Method and apparatus for automatically establishing telephone communication links |
— |
1985-05-21 |
| 4517562 |
FM Communication system |
— |
1985-05-14 |
| 4513415 |
Broadcast synchronization and supervision system |
— |
1985-04-23 |
| 4471408 |
Piggyback code switch device |
— |
1984-09-11 |
| 4415771 |
Public alert and advisory systems |
— |
1983-11-15 |
| 4322842 |
Broadcast system for distribution automation and remote metering |
— |
1982-03-30 |
| 4209269 |
Appliance for the assembly of large-diameter pipes by jointing |
— |
1980-06-24 |
| 4208630 |
Narrow band paging or control radio system |
— |
1980-06-17 |