RICOH SEIKI COMPANY, LTD.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
H01L SEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR 4358
 
  
 
B44C PRODUCING DECORATIVE EFFECTS 232
 
  
 
G01F MEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME 257
 
  
 
G01N INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES 1205

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6230560 Flow measuring device and flow measuring methodMar 24, 99May 15, 01[G01F]
5888761 Etching method for forming air bridge pattern on silicon substrateAug 12, 97Mar 30, 99[H01L]
5801475 Piezo-electricity generation deviceMar 06, 97Sep 01, 98[H01L]
5683546 Method of etching silicon substrate at different etching rates for different planes of the silicon to form an air bridgeOct 22, 93Nov 04, 97[B44C]
5552622 Tunnel transistorJun 23, 95Sep 03, 96[H01L]
5467651 Drive control apparatus for microsensorOct 22, 93Nov 21, 95[G01N]
5406841 Flow sensorMar 17, 93Apr 18, 95[G01F]
5380373 Floating single crystal thin film fabrication methodJul 14, 93Jan 10, 95[H01L, B44C]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5753815 Thermo-sensitive flow sensor for measuring flow velocity and flow rate of a gasExpiredNov 17, 95May 19, 98[G01F]
4775838 Sensor with periodic heatingExpiredMar 04, 86Oct 04, 88[G01N]
4740387 Low power gas detectorExpiredMar 10, 86Apr 26, 88[B05D]
4580439 Low power gas detectorExpiredFeb 07, 84Apr 08, 86[G01N]

Top Inventors for This Owner

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