SIGMA INSTRUMENTS, INC.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
G01C MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY 1104

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
D530019 Personal massagerFeb 23, 04Oct 10, 06[]
6539328 Device and process for measurement and treatment of spinal mobilityApr 30, 99Mar 25, 03[G01C]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2005/0192,519 Motor assemblies and massage assemblies using the sameAbandonedFeb 27, 04Sep 01, 05[A61H]
5111189 Fault indicator with timing controlExpiredNov 27, 89May 05, 92[G08B, H02H]
5097202 Faulted current indicators with improved signal to noise ratiosExpiredJun 05, 89Mar 17, 92[G01R, H01F]
4991054 Time-delay outdoor lighting control systemsExpiredMay 13, 88Feb 05, 91[H01H]
4980790 Fault indicating meansExpiredJan 17, 89Dec 25, 90[H02H]
4968884 Vertically sensitive outdoor lighting controlsExpiredApr 11, 89Nov 06, 90[H01J]
4864264 Bistable toggling indicatorExpiredJan 20, 88Sep 05, 89[H01F]
4859925 Power transmission systems and means for control thereofExpiredDec 19, 86Aug 22, 89[G05F]
4782287 Watt-hour meterExpiredOct 30, 86Nov 01, 88[G01R]
4763034 Magnetically enhanced stepping motorExpiredJul 10, 87Aug 09, 88[H02K]
4712028 Magnetically assisted stepping motorExpiredMay 21, 84Dec 08, 87[H02K]
4700123 Power distribution systems and means for control thereofExpiredSep 17, 85Oct 13, 87[G05F]
4683472 Signal reading system such as for remote reading of metersExpiredAug 05, 82Jul 28, 87[G08C]
4682092 Synchronous motor drive with chopper regulatorExpiredJun 06, 85Jul 21, 87[H02K]
4675590 Stepping motor driver with mid-frequency stability controlExpiredMay 23, 85Jun 23, 87[H02P]
4606231 Strain gauge measuring systemExpiredMar 06, 85Aug 19, 86[G01D]
4272712 Phase locked loop control systemExpiredApr 10, 79Jun 09, 81[G05B]
4271384 Synchronous motor driveExpiredNov 10, 77Jun 02, 81[H02P, G05B]
4258276 Switching circuit for connecting an AC source to a loadExpiredJun 23, 78Mar 24, 81[H03K]
4255696 Synchronous motor systemExpiredNov 17, 76Mar 10, 81[G05B]

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