CHANGMIN CO., LTD.
Patent Owner
Stats
- 0 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- Oct 29, 2002 most recent publication
Details
- 0 Issued Patents
- 0 Issued in last 3 years
- 0 Published in last 3 years
- 217 Total Citation Count
- Aug 24, 1994 Earliest Filing
- 12 Expired/Abandoned/Withdrawn Patents
Patent Activity in the Last 10 Years
Technologies
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Recent Publications
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Recent Patents
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Expired/Abandoned/Withdrawn Patents
Patent #
Title
Status
Filing Date
Issue/Pub Date
Intl Class
6386047 Ultrasonic flow velocity measuring method using phase difference measurementsExpiredFeb 15, 01May 14, 02[G01F]
6332360 Apparatus for measuring the depth, water velocity or water temperature of an open channelExpiredSep 07, 99Dec 25, 01[G01N, G01F]
6089104 Ultrasonic flow meter using transit time across tube chords for determining the flow ratesExpiredMay 27, 97Jul 18, 00[G01F]
5952583 Method of measuring a river horizontal average flow velocityExpiredSep 17, 98Sep 14, 99[G01F]
5842374 Measuring method of a wide range level and an apparatus thereofExpiredMar 17, 95Dec 01, 98[G01F]
5791187 Level measurement method using measurements of water column pressure thereforExpiredMar 22, 96Aug 11, 98[G01F]
5780747 Open channel multichannel ultrasonic flowrate measurement apparatus and methodExpiredDec 18, 95Jul 14, 98[G01F]
5734111 Apparatus for measuring the flow quantity of rivers and method thereofExpiredDec 06, 96Mar 31, 98[G01F]
5515721 Local river flow velocity measuring method and apparatus thereforExpiredAug 24, 94May 14, 96[G01F]
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