[vorbis] Vorbis and Joint Stereo.

[Dan Hollis]

On Fri, 15 Jun 2001, Kristoff Bonne wrote:
> On Thu, 14 Jun 2001, Erato wrote:
> >> If they claim joint stereo is patented, they should be able to give a
> >> USPTO patent number as proof.
> > http://www.mp3licensing.com/patents.html
> How many years are this kind of patent actually valid?
> When do they expire?

US patents are 20 years.

http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1='5,701,346'.WKU.&OS=PN/5,701,346&RS=PN/5,701,346

This is the fraunhofer joint stereo patent.

What are some non-infringing approaches to joint stereo?

-Dan

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