IFR LIMITED

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
G01R MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES 1158
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 1446
 
  
 
H03B GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS 162
 
  
 
H03L AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES 179

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5375065 Waveform generators using digitally generator superimposed waveformsAug 17, 92Dec 20, 94[G06F]
5363049 Single device under test (DUT) port common reference/matching impedance cirtuit for the detection and location of DUT faultsJan 25, 93Nov 08, 94[G01R]
5237291 Microwave frequency synthesizer having selectable oscillator sources and output power controlJun 16, 92Aug 17, 93[H03L, H03B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5790411 Equipment for testing electronic circuitryExpiredOct 31, 96Aug 04, 98[G01R]
5463310 Instrument for measuring the frequency and power of a microwave signalExpiredNov 02, 94Oct 31, 95[G01R]
5399975 Method of testing continuity of a connection between an integrated circuit and a printed circuit board by current probing integrated circuitExpiredJun 01, 93Mar 21, 95[G01R]
5079522 Variable frequency signal generatorExpiredOct 12, 90Jan 07, 92[H03L]
4870384 Frequency or phase modulationExpiredDec 21, 88Sep 26, 89[H03C]
4609881 Frequency synthesizersExpiredMay 03, 84Sep 02, 86[H03L]
4518929 Frequency synthesizer having overtone crystal oscillatorExpiredAug 02, 82May 21, 85[H03L]
4434489 Automatic test systemsExpiredOct 13, 81Feb 28, 84[G01R]
4400630 Frequency multipliersExpiredDec 08, 80Aug 23, 83[H03B]

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