KEITHLEY INSTRUMENTS, INC.

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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 51108
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 5442
 
  
 
H03F AMPLIFIERS 578
 
  
 
H03K PULSE TECHNIQUE 4127
 
  
 
H01F MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES 381
 
  
 
H01H ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES 391
 
  
 
H05K PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS 3153
 
  
 
G05F SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES 298
 
  
 
G06G ANALOGUE COMPUTERS 251
 
  
 
H01P WAVEGUIDES; RESONATORS, LINES OR OTHER DEVICES OF THE WAVEGUIDE TYPE 258

Top Patents (by citation)

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Recent Publications

Publication # Title Filing Date Pub Date Intl Class
2018/0059,157 LOW FREQUENCY IMPEDANCE MEASUREMENT WITH SOURCE MEASURE UNITSOct 21, 17Mar 01, 18[G01R]
2014/0306,671 HIGH PERFORMANCE CURRENT SOURCE POWER SUPPLYApr 12, 13Oct 16, 14[G05F]

Recent Patents

Patent # Title Filing Date Issue Date Intl Class
9559680 Isolated high speed switchOct 24, 14Jan 31, 17[H03K]
9553559 Configurable bias teeOct 23, 14Jan 24, 17[H01P, G01R, H03H]
9541584 Digital voltmeter topologyMar 22, 13Jan 10, 17[G01R]
9478351 Isolation transformer for use in isolated DC-to-DC switching power supplyMay 24, 13Oct 25, 16[H01F]
9453880 Active shunt source-measure unit (SMU) circuitJan 24, 14Sep 27, 16[G01R]
9335364 SMU RF transistor stability arrangementMay 23, 13May 10, 16[G01R]
9326369 Guarded printed circuit board islandsJun 19, 13Apr 26, 16[H05K]
9274145 Active shunt ammeter apparatus and methodOct 22, 12Mar 01, 16[H03F, G01R]
9197236 Digitizer auto aperture with trigger spacingDec 12, 14Nov 24, 15[H03M, G01R]
9077301 Nanovolt amplifier designMay 30, 13Jul 07, 15[H03F]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2014/0167,905 HIGH VOLTAGE PROTECTION MODULEAbandonedDec 17, 12Jun 19, 14[H01H]
8507802 Ultra-low current printed circuit boardExpiredMay 01, 08Aug 13, 13[H05K]
7855544 AC low current probe cardExpiredMay 01, 08Dec 21, 10[G01R]
7853425 Parallel testing in a per-pin hardware architecture platformExpiredJul 11, 08Dec 14, 10[G06F, G01R]
7724017 Multi-channel pulse testerExpiredAug 31, 06May 25, 10[G01R]
7683647 Instrument per pin test headExpiredSep 05, 08Mar 23, 10[G01R]
7633308 Combined pulse and DC test systemExpiredFeb 09, 07Dec 15, 09[G01R]
7425837 Spatial transformer for RF and low current interconnectExpiredMay 18, 06Sep 16, 08[G01R]
7280929 Method and apparatus for pulse I-V semiconductor measurementsExpiredSep 29, 04Oct 09, 07[G01R]
7224160 RF and pulse bias teeExpiredFeb 21, 06May 29, 07[G01R]
7205773 Method for calibrating a pulsed measurement systemExpiredSep 29, 04Apr 17, 07[G01R]
6900649 High frequency RF interconnect for semiconductor automatic test equipmentExpiredSep 23, 03May 31, 05[G01R]
6262670 Source measure unit having secondary feedback for eliminating transients during range changingExpiredApr 10, 98Jul 17, 01[G08B]
5918194 Integrated modular measurement system having configurable firmware architecture and modular mechanical partsExpiredAug 01, 97Jun 29, 99[G01R]
5808475 Semiconductor probe card for low current measurementsExpiredJun 07, 96Sep 15, 98[G01R]
D343799 Electronic measuring/monitoring instrumentExpiredOct 11, 91Feb 01, 94[]
D343800 Electronic measuring/monitoring instrumentExpiredOct 11, 91Feb 01, 94[]
5144154 Range changing using N and P channel FETSExpiredMay 21, 90Sep 01, 92[H03K, G01R]
5039934 Control for voltage/current source with current/voltage limitingExpiredMay 22, 90Aug 13, 91[G05F]
4598253 JFET ohmic differential amplifierExpiredSep 17, 84Jul 01, 86[H03F]

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