Piezoelectric bone conductive in ear voice sounds transmitting and receiving apparatus
Patent 4150262 Issued on April 17, 1979. Estimated Expiration Date: 
April 21, 1997. 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.
April 21, 1997. 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 1630028 2339148 2339173 2535063 3209082 3408461 3819860 InventorApplicationNo. 05/789606 filed on 04/21/1977US Classes:381/326, Non-air-conducted sound delivery381/190, Electrostrictive, magnetostrictive, or piezoelectric381/328Ear insertExaminersPrimary: Stellar, George G.Attorney, Agent or FirmInternational ClassesH04M 1/62 (20060101)H04R 1/22 (20060101) H04R 17/00 (20060101) H04R 1/14 (20060101) H04R 1/46 (20060101) H04R 1/00 (20060101) H04R 17/02 (20060101) Foreign Application Priority Data1974-11-18 JPAbstractA voice sound transmitting and receiving apparatus suitable for the use under noisy circumstances and designed to be inserted into the external auditory canal of a user for attaining the voice sound transmitting and receiving operation using the vibrations of the external auditory canal wall. | |
