Patent or schematic of Cloudlifter microphone activator?

This is what came up on a goggle search of Cloudlifter patent:


https://patents.google.com/patent/US9668045B1/en


Later today's addition:


Patent document was downloaded from espacenet and double side printed on A4 paper.


A great idea. After skim reading the patent document, the greatest impression is of the long tailed pair cascode configuration with 2 JFETs in cascode for the + input and 2 JFETs in cascode for the - input. The cascode circuit by Wallman.


It is interesting that Allen Wright in his Tube Preamp Cookbook (1994?) shows, describes in detail such circuits, schematics with electron tubes as evolution from Tektronics or HP oscilloscope schematics or gain stages adding (combining) the cascode configuration to the long tailed pair configuration. Allen Wright had been wondering why the pro audio community had not been using such circuits yet?


Bravo to inventor Rodger Cloud for his invention of the Cloudlifter front end amplifier.


Patent is US9668045