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. 28, 1989
Filed:
Jul. 09, 1987
Tadashi Ikeda, Kanagawa, JP;
Kazuo Shigematsu, Saitana, JP;
Yasushi Miyauchi, Tokyo, JP;
Motoyasu Terao, Tokyo, JP;
Tetsuya Nishida, Tokyo, JP;
Shinkichi Horigome, Tokyo, JP;
Norio Ohta, Sayama, JP;
Ryo Suzuki, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An electron beam memory system in which a phase transition type recording film is used as an information recording medium, and for recording information, a focused electron beam is selectively projected on desired positions of the recording film so as to locally heat the recording film and cause phase transition, while for retrieving information, an electron beam having energy at a degree not causing the phase transition is projected so as to utilize the fact that reflection or diffraction of the primary electron beam projected at the retrieval differs between the recorded regions and unrecorded regions.