LEEDS & NORTHRUP CO.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 3444
 
  
 
G06T IMAGE DATA PROCESSING OR GENERATION, IN GENERAL 1134
 
  
 
H04N PICTORIAL COMMUNICATION, e.g. TELEVISION 1241

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5734894 Methods and apparatus for protecting the integrity of process data stored on a removable storage mediumApr 25, 95Mar 31, 98[G06F]
5625819 Methods and apparatus for performing heap management and protecting data structure integrity in non-volatile memoryApr 26, 95Apr 29, 97[G06F]
5617522 Methods and apparatus for providing and/or customizing display screens and operator interfaces for process control and measurement instrumentsApr 03, 95Apr 01, 97[G06T]
RE31773 Cathode ray tube system with strip chart recorder display formatSep 28, 81Dec 18, 84[H04N]
RE31774 Measuring systemSep 15, 83Dec 18, 84[G06F]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4545029 Remote correlation of sequence of eventsExpiredJan 13, 84Oct 01, 85[G06F]
4492948 Fast response surface contact temperature sensorExpiredSep 02, 81Jan 08, 85[H01C]
4473889 Remote correlation of sequence of eventsExpiredSep 11, 81Sep 25, 84[G06F]
4469717 Thin film resistance thermometer with a predetermined temperature coefficient of resistance and its method of manufactureExpiredNov 02, 81Sep 04, 84[B05D]
4429343 Humidity sensing elementExpiredDec 03, 81Jan 31, 84[H01G]
4419733 Time deviation and inadvertent interchange correction for automatic generation controlExpiredApr 20, 81Dec 06, 83[G06G]
4417303 Multi-processor data communication bus structureExpiredFeb 25, 81Nov 22, 83[G06F]
4407013 Self tuning of P-I-D controller by conversion of discrete time model identification parametersExpiredOct 20, 80Sep 27, 83[G05B]
4390796 Voltage to duty cycle converterExpiredApr 15, 81Jun 28, 83[H03L, H03K]
4390925 Multiple-cavity variable capacitance pressure transducerExpiredAug 26, 81Jun 28, 83[H01G]
4389674 Preamplifier for low voltage signals in the presence of high voltage noiseExpiredMar 05, 81Jun 21, 83[H03K, H04N]
4385362 Filter arrangement for elimination of unwanted bias in a model reference process control systemExpiredOct 20, 80May 24, 83[G05B]
4375333 Microprocessor directed optical pyrometerExpiredOct 16, 80Mar 01, 83[G01J]
4375663 Power failure early warning circuit for microprocessor with CMOS RAM memoryExpiredMar 31, 80Mar 01, 83[G06F, G11C]
4375056 Thin film resistance thermometer device with a predetermined temperature coefficent of resistance and its method of manufactureExpiredFeb 29, 80Feb 22, 83[H01C]
4374351 Digital drive unit regulatorExpiredDec 09, 80Feb 15, 83[G05B]
4368510 Automatic identification system for self tuning process controllerExpiredOct 20, 80Jan 11, 83[G05B]
4337434 Compensator for slowly responding sensorsExpiredMay 02, 80Jun 29, 82[H03K]
4337456 Analog to digital converter with offset error correctionExpiredApr 16, 79Jun 29, 82[H03K]
4333352 Injection-molded Doppler flowmeter transducer assemblyExpiredOct 14, 80Jun 08, 82[G01F]

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