Oh, I'd contact all three big long-distance companies.  But AT&T has by far
the most to lose, because they have the largest market share, so they'd
probably pay the most to suppress it.  
>Also, why are we being so generous selling a device for $80 that saves
>the buyer $300 per year?  Does it only last for three months?  It seems
>if it has a mean lifespan of several years minimum like most appliances,
>the minimum selling price should be upwards of $500.
Well, I'm simplifying.  Actually the right business model is to sell it for
$80 and then charge the customers half the money they save every month-- $6
or so.  But even if we couldn't charge them by the month, it would still be
the right thing to charge $80 for them.  Consumers don't buy money-saving
devices unless they pay for themselves in six months or less.  It's crazy,
but my business-savvy wife says this is a well-known fact of retailing.  I
knocked another factor of two off that because at least at first, they will
be unproven devices, and consumers will be wary of dropping $150 on them.
The reason it makes sense for AT&T to buy this invention is the irrational
short-termism of consumers, and the high information cost of convincing
consumers that it really worth, as you say, upwards of $500.  Unlike the
consumers, AT&T is long-term, and willing to be convinced by e.g. a
prototype deployment with 100 customers, which would only cost $150,000 by
our estimates.
In a market meeting classical criteria of efficiency, this kind of
suppression would not make sense: the customers would pay what the device
was worth, and the former supplier (AT&T) would be screwed, because they'd
lose just as much money by  buying the patent as by losing customers to the
competition.  
--CarlF