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. 11, 1997
Filed:
Jun. 04, 1996
Yoshikazu Akiyama, Yokohama, JP;
Sachiko Kimura, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A ferroelectric material has hysteresis characteristics in the polarization-electric field relationship thereof, exhibits an antiferroelectric phase at room temperature, and carries out a structural phase transition from the antiferroelectric state to a ferroelectric phase with the application of an electric field thereto, and a phase transition electric field with which the antiferroelectric-to-ferroelectric phase transition is carried out is shifted to a lower electric field with the elevation of the temperature thereof, and a phase transition electric field with which a ferroelectric-to-antiferroelectric phase transition is carried out has a negative value. A semiconductor non-volatile memory, a rewritable optical recording medium, a highly integrated micro-displacement control device, and a shape memory device, each utilizing the above-mentioned ferroelectric material, are provided.