[time-nuts] WWVB / Xtendwave patents

[Jim Lux]

On 9/27/12 2:58 PM, Bob Camp wrote:
> Hi
>
> It would be interesting to hear what the patent lawyers on the list think about the patents. Given a quick read, they appear to cover any use of the specific transmitted format for receiving time information.
>
IANAL, but..
reading Claim 1..
a key aspects are the combination of PSK and ASK, with different data. 
This is somewhat unusual, and may not have been done exactly like that.

"said phase modulation *is independent* of the information represented 
by said pulse width modulation/amplitude shift keyed modulation" is a 
phrase that occurs in ALL of the independent claims.

(my emphasis added)

QAM is, of course, simultaneous PSK and ASK, but it's a single data 
stream that is being encoded.

Is there prior art for transmitting one kind of data using ASK and 
something else PSK?

For instance, is WWV (which is primarily ASK) has a subcarrier, but the 
subcarrier is also AM.

Another possible source of prior art might be a PSK encoded digital 
squelch on a AM or FM modulated signal (if such a system exists).





> Bob
>
> On Sep 27, 2012, at 2:54 PM, Scott Newell <newell+timenuts at n5tnl.com> wrote:
>
>> Looks like one has issued (8,270,465).  Application 20120082008 appears to be relevant as well.
>>
>> http://www.google.com/patents/US8270465
>>
>> http://www.google.com/patents/US20120082008
>>
>>
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