Read/write optical memory
Patent 5051950 Issued on September 24, 1991. Estimated Expiration Date: 
July 31, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 31, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3868653 Method of writing and erasing information for electrooptic ceramic memories Ferroelectric-photoconductor optical storage Patent #: 4041477 InventorsAssigneeApplicationNo. 387938 filed on 07/31/1989US Classes:365/109, Photoconductive and ferroelectric365/112, Photoconductive365/117FerroelectricExaminersPrimary: Fears, Terrell W.Attorney, Agent or FirmInternational ClassesG11C 011/22G11C 011/42 AbstractAn improved read/write optical disk is disclosed which is capable of being rewritten more than 106 times. The disk utilizes a storage medium in which data is stored as different polarization states in the same phase of the material. The preferred embodiment utilizes a lead lanthanum zirconate titanate material for the storage medium. The state of polarization of the material at the location of a specified data bit is changed by applying a voltage to the bit location in question. The location is specified by illuminating the surface of the disk with light in the infra-red. | |
