The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 1978
Filed:
May. 19, 1977
Applicant:
Inventors:
Gerard Dreyfus, Villebon sur Yvette, FR;
Jacques Lewiner, Saint Cloud, FR;
Assignee:
Agence Nationale de Valorisation de la Recherche (ANVAR), Neuilly, Seine, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
310328 ; 310800 ;
Abstract
A leaf of suitable dielectrical material bears, trapped on one at least of its two surfaces, equal or substantially equal amounts of positive and negative electrostatic charges, these charges being preferably injected into the leaf by successive ionization in reverse directions of gaseous layers against said surface. The device is valuable in piezoelectric or pyroelectric devices such as ultrasonic transducers, pressure or vibration detectors, microphones, heat or infrared radiation detectors.