Interactive multi-user laser disc system
Patent 4644515 Issued on February 17, 1987. Estimated Expiration Date: 
November 20, 2004. 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.
November 20, 2004. 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 3930145 Disc drive with rotary access mechanism Patent #: 4019205 InventorsAssigneeApplicationNo. 06/673549 filed on 11/20/1984US Classes:369/30.31, For operation of storage medium gripper, accessor, or transfer member360/98.01, Plural disks369/111, Spiral or helical track369/30.34For linear array positioning of unitary plural storage medium carrier (e.g., horizontal or vertical positioning)ExaminersPrimary: Richardson, Robert L.Attorney, Agent or FirmInternational ClassesG11B 17/038 (20060101)G11B 23/03 (20060101) G11B 7/00 (20060101) G11B 25/04 (20060101) G11B 17/02 (20060101) G11B 17/22 (20060101) G11B 7/08 (20060101) G11B 7/0037 (20060101) AbstractAn interactive plural head laser disc system is characterized by pairs of head arrays installed on both sides of one or more laser discs. The heads may be accessed by either multiple or single users to independently and simultaneously access a single disc or plurality of discs. Each head array includes a plurality of read heads formed on a substrate to be in registry with the tracks of data on the discs to enable the reading of all tracks simultaneously and independently.Other References
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