Frequency Counter Patents


© Brooke Clarke, N6GCE

Current Class

Search for 324/76.xx (ccl/324/76.4$) - 1480 hits 22 Apr 2003
377/49 - 199 hits
702/78 - 52 hits


2992384 Frequency Counter TRW July 11, 1961 324/76.58; 324/76.15; 324/76.24; 324/76.42; 327/47; 702/78
3213361 Computer for Making Calculations Involving Signal Frequencies WE Oct. 19, 1965 Period and Ratio 702/78; 324/76.47; 324/76.55; 324/704; 324/707; 341/157; 377/47
3304504 Gate Generator Synchronizer US Navy Feb 14, 1967 324/76.48; 324/76.47; 324/76.55; 327/23; 327/43; 327/141; 377/55; 702/78
3984770 Frequency measurement using phase continuous frequency switching HP October 5, 1976 324/76.53; 324/76.44; 324/76.77; 327/48; 702/78
3836758 Wide Frequency Range Counter System Utilizing Automatic Range Searching and Loop Compensation HP Sept. 17, 1974 702/75; 324/76.48; 324/76.53; 324/76.56; 324/76.62; 377/43 - automatic 1 Hz to 18 GHz
4027146 High speed accurate low frequency counter Heath Company May 31, 1977 702/78; 324/76.47; 324/76.55; 377/49 - multiple cycle interval to frequency
4135243 Single sampler heterodyne method for wideband frequency measurement HP January 16, 1979 702/78; 324/76.42; 324/76.47; 324/76.55; 327/9 - LO frequency is pseudorandom modulated and correlation used to determine harmonic number thus improving rejection of FM modulation.
4150432 Frequency counter and method HP April 17, 1979 702/78; 324/76.47; 324/76.55; 708/101
4395762 Frequency counter July 26, 1983 702/78; 324/76.45; 324/76.48; 324/76.62; 377/20 - output of proton precession magnetometers
3609326 Counting Aparatus and Method using Seperate Counters for Reference and Unknown Signal HP   Sep 28, 1971 377/49; 324/76.48; 324/76.62 - One counter counts an integer number of cycles of the input signal and a second counter counts the fast reference signal.
2677104
2951202
3221250
3412329
3450991
3566160
5333162  High resolution time interval counter US DOE July 26, 1994 377/20; 377/29; 377/49 - pulse streacher on A & B inputs
4991188 Digital frequency divider NCR February 5, 1991 377/49; 377/48; 708/103 - divide by Y/X (both integers)

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