Searching US Patent Collection...

	PAT. NO.		Title
1	5,258,928		Parts efficient memory based functional circuit having selectable transfer characteristics
2	5,255,078		Impulse noise detector for a video signal receiver
3	5,229,847		Television signal processing system including modulated auxiliary carrier
4	5,177,611		Method and apparatus for canceling quadrature distortion as for video signals having in-phase and quadrature phase components
5	5,155,580		Side panel signal processor for a widescreen television system
6	5,103,310		Interference reduction for extra-spectrum, compatible television system
7	5,063,446		Apparatus for transmitting auxiliary signal in a TV channel
8	5,053,858		Chrominance signal processing appartus for widescreen television system
9	4,958,230		Method of transmitting auxiliary information in a television signal