[Freeswitch-users] g729 patent expiration

Erkan Durmuş derkan at gmail.com
Wed Aug 3 17:56:37 MSD 2016

A Google search says that:

"US patents with a filing date before June 8, 1995 provide protection 
for up to seventeen years counting from the date of grant (the date 
given with reference numeral 45), or 20 years from the filing date, 
whichever expires later. However, the patent holder is required to pay 
maintenance fees to keep his patent valid."

On Tue, Aug 2, 2016 at 11:05 PM, Max Clark <max.clark at gmail.com> wrote:
> Hi all,
> So I fell down the Google rabbit hole this weekend - the subject of 
> my curiosity: US Patent No. 5,920,8531
> This patent has a priority/filing date of August 23, 1996, which 
> would imply that the g729 is in the open next month. Is this 
> accurate? Am I missing another patent that keeps this behind the 
> commercial pay wall?
> I'm asking b/c I'd obviously rather not license channels and find out 
> it was unnecessary a month later.
> Max
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