LEEDS & NORTHRUP CO.
Patent Owner
Stats
- 5 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- Mar 31, 1998 most recent publication
Details
- 5 Issued Patents
- 0 Issued in last 3 years
- 0 Published in last 3 years
- 699 Total Citation Count
- May 15, 1978 Earliest Filing
- 33 Expired/Abandoned/Withdrawn Patents
Patent Activity in the Last 10 Years
Technologies
Intl Class
Technology
Matters
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Top Patents (by citation)
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Recent Publications
- No Recent Publications to Display
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]
Expired/Abandoned/Withdrawn Patents
Patent #
Title
Status
Filing Date
Issue/Pub Date
Intl Class
4469717 Thin film resistance thermometer with a predetermined temperature coefficient of resistance and its method of manufactureExpiredNov 02, 81Sep 04, 84[B05D]
4419733 Time deviation and inadvertent interchange correction for automatic generation controlExpiredApr 20, 81Dec 06, 83[G06G]
4407013 Self tuning of P-I-D controller by conversion of discrete time model identification parametersExpiredOct 20, 80Sep 27, 83[G05B]
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]
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]
4368510 Automatic identification system for self tuning process controllerExpiredOct 20, 80Jan 11, 83[G05B]
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