Acoustic charge transport device and method
Patent 4633285 Issued on December 30, 1986. Estimated Expiration Date: 
December 30, 2003. 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.
December 30, 2003. 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 3675140 3714609 3792321 3827002 3858232 3877982 Charge storage and monitoring apparatus utilizing acoustic waves Elastic wave detector Electronically variable surface acoustic wave phase shifter Monolithic surface acoustic wave signal storage device InventorsAssigneeApplicationNo. 06/515846 filed on 07/21/1983US Classes:257/222, Responsive to non-electrical external signal (e.g., imager)257/249, Electrode structures or materials257/416Acoustic waveExaminersPrimary: Larkins, William D.Assistant: Mintel, William Attorney, Agent or FirmInternational ClassesH03H 9/00 (20060101)H03H 9/42 (20060101) H03H 11/26 (20060101) H03H 9/02 (20060101) AbstractThe disclosure is directed to a method and a device for delaying an electrical signal, the method and device being useable in various signal processing applications. A buried channel is formed by disposing a portion of a layer of piezoelectric semiconductor material between confining layers. A surface acoustic wave is established in the piezoelectric semiconductor material. Majority carriers are depleted from the channel, and an electrical signal is injected into the channel. A delayed version of the electrical signal, which had been carried along by the surface acoustic wave, can then be extracted from the channel.Other References
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