Does Moog still hold the patent for the Ladder Filter?
It is my understanding that patents become public domain after 20 years, and I cannot find a patent after 1968 for the ladder.
Does anyone know? Its a pretty useful and reliable filter, with just limitless possibilities!
I assume they do not, as many new synths now employ variations of the patented filter.
It is my understanding that patents become public domain after 20 years, and I cannot find a patent after 1968 for the ladder.
Does anyone know? Its a pretty useful and reliable filter, with just limitless possibilities!
I assume they do not, as many new synths now employ variations of the patented filter.