High accuracy frequency standard and clock system
Patent 4899117 Issued on February 6, 1990. Estimated Expiration Date: 
December 24, 2007. 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 24, 2007. 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 ReferencesFrequency synthesizer incorporating digital frequency translator Methods and apparatus for rapid and accurate frequency syntonization of an atomic clock Time corrected, continuously updated clock Apparatus for and method of compensating for variations due to aging Patent #: 4633422 InventorAssigneeApplicationNo. 138790 filed on 12/24/1987US Classes:331/3, Molecular resonance stabilization331/44, WITH FREQUENCY CALIBRATION OR TESTING331/47, Oscillator used to vary amplitude or frequency of another oscillator331/176, Temperature or current responsive means in circuit368/56, By signal frequency change368/202For compensationExaminersPrimary: Grimm, Siegfried H.Attorney, Agent or FirmInternational ClassH03L 007/26AbstractA high accuracy atomic frequency standard and clock which utilizes a micrmputer. The microcomputer compensates for aging and temperature variations in the atomic standard and its slave crystal oscillator and generates an error signal which is used to either correct the frequency of the slave crystal oscillator or to adjust the number of clock pulses per unit time interval. No C-field adjustment is employed.Field of SearchMolecular resonance stabilizationWITH FREQUENCY CALIBRATION OR TESTING MOLECULAR OR PARTICLE RESONANT TYPE (E.G., MASER) WITH FREQUENCY ADJUSTING MEANS With voltage sensitive capacitor Oscillator used to vary amplitude or frequency of another oscillator Diverse-type oscillators Synchronized, triggered or pulsed Temperature or current responsive means in circuit PLURAL TIMEPIECE SYSTEM OR SYSTEM DEVICE (E.G., PRIMARY OR SECONDARY CLOCKS) Primary with direct synchronization or drive By signal frequency change Secondary ELECTRICAL TIME BASE Solid state oscillating circuit type For adjusting the frequency or beat For compensation | |
