Using the piezo design guide from piezo-kinetics, http://www.piezo-kinetics.com/Catalog_pages_15-26.pdf, I calculated the patent's piezo with an outer diameter of .1mm and inner diameter of .033mm to produce on average 121mV in standard temperature and pressure, assuming that the foil diaphragm allows the strike area to be the full diameter of the piezo, .1mm. I didn't see how the foil extending outward from the outer diameter of the piezo to the flush ceramic base could help produce a force, since it would be bending in this area, negating pressure force. I can see why the inventor had trouble getting substantial voltages, when using a steel foil as the diaphragm. Mechanical stress could oppose some of the pressure force.

high guys, i found -years before-the patentschrift dd287597.
for global interests-i,for myself think it-could be the dd286012
similar to the solar-cycle(carl friedrich von Weizsaecker,club of rome)
but "fuer die friedliche Nutzung" of the surrounded ambient energy
without great costs and sustainable.

Look also at "Piezoelectric energy" http://www.overunity.com/index.php/topic,121.0.html. There are also some interesting information listed.

Regards

Andreas Varesi

what is,without words,in a real tridimensional explanation "piezo-electric"?
The reverse mode of the liquid iron demonstration(Don Adsitt),material stress noise?
thermovoltaic=thermalnoise
thermic=motion,maxwell/boltzmann;

Hello to all,
Look at the patent #413,353 of Tesla.
Simple method to rectify the AC to DC current using a modified transformer.