Olin Lathrop wrote:

>Tim N9PUZ wrote:
>  
>
>>Does anyone have recent experience with receiving a hardware or
>>process patent? I was curious how long it took from initial
>>application to issue. An attorney we know said recently that quite a
>>few are stretching out to 4-5 years or more.
>>    
>>
>
>My last patent that has gone all the way thru the process took about 3 years
>from first filing to issue (hardware for spacial subdivision to accellerate
>ray tracing).  I have another patent currently about 11 months since first
>filing and haven't heard anything other than the usual confirmations that
>the paperwork was received.
>
>By the way, Dave Tweed is the other co-inventor on this one, which has to do
>with controlling switching power supplies, including PFC, without ever
>measuring current.  Digital computation is used to infer current from other
>measurements.  We can do full power factor corrected input by only measuring
>the input and output voltages and then doing some computation in a micro.
>Another cool part is that similar digital computation can be applied to
>regulate the output voltage of a PFC supply more tightly than the
>traditional approach that just low pass filters the output control response
>to not defeat the PFC function.  This means we can replace large and
>expensive electronics like bulk capacitors and current senses with ever
>cheaper computational power.
>  
>
Is that what you plan to speak on at Masters'?

Looks good, Olin.

--Bob

>The proof of concept prototype used an early 30F2010.
>
>
>******************************************************************
>Embed Inc, Littleton Massachusetts, (978) 742-9014.  #1 PIC
>consultant in 2004 program year.  http://www.embedinc.com/products
>  
>


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