Re(2): [Antennas] Antenna-Related Patents

[DavidE Benedict]

I may be misssing soemthing here, but fairly large binocular cores are
widely used in high power transistor RF amps ...for coupling, push-pull
transformers, paralleling amplifier stages, and in matching transistor
outputs to whatever. 250 watt cores are not uncommon.

David
W7DBH




richard at karlquist.com,Internet writes:
>I think this patent, as narrowly construed, could hold up.  Although
>binocular cores are common, all the ones I have seen are tiny ones
>for receiving.  And using them for transmit is not obvious to the
>average engineer.  (If it were obvious, people would be doing it).
>It is fairly easy to get around the patent, such as with the baluns K9YC
>talks about.  I suspect they are even better than the binocular
>core ones in the patent.  Also, I don't know where you would get
>large binocular cores.  Maybe Tom paid for tooling to make them.
>It costs several $1000 to make the tooling.
>
>Having filed dozens of patent applications, I can tell you that
>this is the patent system we have, for better or worse.  The high
>cost of filing patents might discourage these niche patents in
>the future.
>
>I'm not aware of Tom claiming that baluns did not exist.
>I would be surprised if he actually said that.  Can
>you give us an example?
>
>Rick Karlquist N6RK
>
>
>
>Chris Trask wrote:
>>     Every once in a while I run across a patent where it's extremely
>obvious
>> that someone has patented public domain property by way of twisting
>language
>> around, such as the extensive ones granted to Parker Vision years ago. 
>I
>> ran across a recent one of these yesterday evening:
>> 
>>     http://tinyurl.com/3qjms3
>> 
>>     It's a simple choke balun made with a binocular core.  These have
>been
>> around for so long that it's very likely that the prototype has
>> disintegrated back to dust.  However, one look at the inventor's name
>made
>> it very clear what had taken place.  Those of you who have been around
>this
>> hobby for any length of time will probably recognize the name right
>away.
>> The filing date is right around the time when this fellow was running
>around
>> on various lists claiming that baluns and transmission line
>transformers in
>> general did not exist.
>> 
>>     Some things never change.
>> 
>>      ,----------------------.       High Performance Mixers and
>>     /    What's all this     \    Amplifiers for RF Communications
>>    / extinct stuff, anyhow?  /
>>    \  _______,--------------'           Chris Trask / N7ZWY
>>   _ |/                                  Principal Engineer
>>  oo\                                  Sonoran Radio Research
>> (__)\       _                             P.O. Box 25240
>>   \  \    .'  `.                     Tempe, Arizona 85285-5240
>>    \  \  /      \
>>     \  '"        \                 IEEE Senior Member #40274515
>>      .       (  ) \
>>       '-| )__| :.  \              Email: christrask at earthlink.net
>>         | |  | | \  '.       http://www.home.earthlink.net/~christrask
>>        c__; c__;  '-..'>.__
>> 
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>> 
>> 
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