Portable telephone having removable transducer
Patent 5724667 Issued on March 3, 1998. Estimated Expiration Date: 
July 7, 2017. 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 7, 2017. 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 3824465 3904843 Portable radiotelephone with control switch disabling Patent #: 4845772 InventorAssigneeApplicationNo. 889085 filed on 07/07/1997US Classes:455/575.2, Headgear379/422, Switch or switch actuator structure379/424, Receiver or handset position responsive (e.g., hookswitch)381/123SWITCHINGExaminersPrimary: Eisenzopf, Reinhard J.Assistant: Armstrong, Darnell R. Attorney, Agent or FirmForeign Patent References
International ClassH04B 001/38Foreign Application Priority Data1993-11-19 JPAbstractA portable telephone includes a main body of the telephone, a transducer (preferably an earphone) contained in the main body so that it can be removed therefrom, a cord connecting the transducer and the main body, and a switching mechanism. The portable telephone further comprises transmitting means and a transmission/reception circuit. In one embodiment of the present invention, the switching mechanism switches between an off-hook state and an on-hook state in conjunction with the removing and containing of the transducer from and into the main body of the telephone preferably through the delivery or taking up of the cord from and into the main body of the telephone. In a second embodiment, the portable telephone further includes a hinged lid which is rotatably supported to close an opening provided in the main body. The hinged lid preferably has a protuberance thereon so that when the hinged lid is opened and closed, the projection causes the switching mechanism to place the telephone in an off-hook and on-hook state, respectively.Field of SearchBody attached or connectedMobile or portable With casing or housing Switch or switch actuator structure Separate housings for earphone and microphone (e.g., candlestick type) Receiver or handset position responsive (e.g., hookswitch) With mechanism for latching hookswitch or plunger against motion Body supported (e.g., headgear) With particular frame or frame carrier Lock against spool winding With additional lock release SWITCHING HEADPHONE CIRCUITS | |
