Ingestible size continuously transmitting temperature monitoring pill
Patent 4844076 Issued on July 4, 1989. Estimated Expiration Date: 
August 26, 2008. 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.
August 26, 2008. 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 3739279 Miniature ingestible telemeter devices to measure deep-body temperature Temperature responsive transmitter Patent #: 4689621 InventorsAssigneeApplicationNo. 07/236885 filed on 08/26/1988US Classes:600/302, Endoradiosonde128/903, RADIO TELEMETRY600/549Temperature detectionExaminersPrimary: Cohen, Lee S.Assistant: Getzow, Scott M. Attorney, Agent or FirmInternational ClassesA01K 11/00 (20060101)A61B 5/00 (20060101) A61B 5/07 (20060101) G01K 1/00 (20060101) G01K 7/32 (20060101) G01K 1/02 (20060101) AbstractA temperature responsive transmitter is disclosed. The transmitter utilizes a unique circuit design that allows encapsulation in an ingestible size capsule. The inventive circuit design uses a one transistor inverting amplifier with a tank circuit forming the link between the transistor's collector and the battery. The tank circuit is tuned to provide a lagging capacitive load which causes the inverting amplifier to oscillate. The tank circuit contains a coil inductor that emits a near field magnetic communications field containing temperature information. The ingestible size temperature pill can be configured in a rechargeable embodiment. In this embodiment the pill uses the inductive coil in the tank circuit as the magnetic pickup to charge a rechargeable nickel cadmium battery.Other References
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