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:
Mar. 10, 2015
Filed:
Sep. 11, 2009
Vladimir Leonov, Leuven, BE;
Vladimir Leonov, Leuven, BE;
IMEC, Leuven, BE;
Abstract
A patterned electret structure () on a substrate () comprises a dielectric structure comprising at least one non-patterned dielectric layer (), and a charge pattern () in the dielectric structure and/or at a surface of a dielectric layer that is part of the dielectric structure and/or at an interface between dielectric layers that are part of the dielectric structure. By the presence of the non-patterned dielectric layer (), the influence of the presence of a conductive substrate () on the charges () of the electret structure () is alleviated, hence increasing the charge stability over time. Moreover, in embodiments of the present invention, the charge stability is substantially independent of the width (W, W, W) of the charge pattern. A method for manufacturing such patterned electret structure () is also provided.