How is this unique?

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Gus said:
found this looking for something else
https://patents.google.com/patent/US9668045B1/en

How is this unique?
It is in the sense that it uses a cascode, that no one else uses because there is no advantage to it, except it allows using lower voltage FET's. They just say it is part of the "invention", but do not claim any benefit from it.
Patent clerks are not concerned with performance, only with originality.
 
I did not  post a lot in the first post because I wanted to see if a discussion would start.

JFET cascodes can be found in other microphones.


The odd thing is I was looking for something else it did have cascode in the search and this was an early result from google.

 

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