Tandy Corporation

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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 3156
 
  
 
G11B INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER 2136
 
  
 
H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS 275
 
  
 
H04M TELEPHONIC COMMUNICATION 2161
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 1446
 
  
 
H01M PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY 1153

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5606481 Overvoltage protection for battery powered equipmentSep 26, 94Feb 25, 97[H02H]
5479083 Non-dissipative battery charger equalizerJun 21, 93Dec 26, 95[H01M]
5402468 Telephone answering device with standardized internal busJun 15, 92Mar 28, 95[H04M, G06F]
5396168 Digital multimeter with microprocessor controlMar 27, 92Mar 07, 95[G01R]
5373410 Single string resistive divider network for a digital multimeterMar 27, 92Dec 13, 94[H02H]
5341089 Voltage to decibel converter having partial table lookupMar 27, 92Aug 23, 94[G01R]
5294889 Battery operated capacitance measurement circuitMar 27, 92Mar 15, 94[G01R]
5208801 Method and apparatus for correcting focus in an optical recording systemAug 23, 91May 04, 93[G11B]
5128921 Method and apparatus for pre-compensation in an optical discJun 20, 91Jul 07, 92[G11B]
5090052 Telephone system with multiple extension telephonesApr 09, 91Feb 18, 92[H04M]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6393103 Method and apparatus for emulating telephone servicesExpiredSep 22, 98May 21, 02[H04M]
6339695 Cordless phone data transferExpiredMay 05, 99Jan 15, 02[H04Q]
6292563 Volume attenuator for flip-style hand-held phoneExpiredOct 16, 98Sep 18, 01[H04M]
5742671 Self-adjusting telephone line status detection indicationExpiredOct 22, 92Apr 21, 98[H04M]
5657384 Full duplex speakerphoneExpiredMar 10, 95Aug 12, 97[H04M]
5594601 Method of programming audio tracks in a sequential mediumExpiredMay 03, 95Jan 14, 97[G11B]
5533120 Acoustic feedback cancellation for equalized amplifying systemsExpiredFeb 01, 94Jul 02, 96[H03G]
5480325 Coaxial connector plug and method for assemblyExpiredMay 27, 94Jan 02, 96[H01R]
5467463 System independent timing reference for computerExpiredFeb 27, 92Nov 14, 95[G06F]
5434394 Automated order and delivery systemExpiredFeb 25, 94Jul 18, 95[G06F]
5418910 Dual buffer cache system for transferring audio compact disk subchannel information to a computerExpiredMay 05, 92May 23, 95[G06F]
5414373 Automatic transistor checkerExpiredFeb 14, 94May 09, 95[G01R]
5414859 Interprocessor communication protocol with built-in error prevention encodingExpiredAug 13, 93May 09, 95[G06F]
5406544 Low cost substrate for bump-forming recording mediaExpiredJul 25, 91Apr 11, 95[G11B]
D353468 Building entranceExpiredApr 09, 93Dec 13, 94[]
5355082 Automatic transistor checkerExpiredMar 27, 92Oct 11, 94[G01R]
5321563 Biasing and erasing apparatus and method for magnetic tape recording devices to improve signal-to-noise ratioExpiredJun 15, 92Jun 14, 94[G11B]
5310997 Automated order and delivery systemExpiredSep 10, 92May 10, 94[G06F]
5261072 Compact disk data transfer system using cache memoryExpiredOct 31, 91Nov 09, 93[G06F, G11C]
5231624 System and method using a reduce profile light beam for high density recording on optical mediaExpiredAug 01, 91Jul 27, 93[G11B]

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