Assignee
HACH CO
US·193 granted patents·67 pending applications·1,872 citations·filing 1984–2025
Top patents by PatentIndex Score
260 records- 0196US9015003B2Water monitoring systemHACH CO·Filed 2013·Granted Apr 21, 2015·22 cites·17 claims
- 0295US12044622B2Method for measuring monochloramine with a thiocarbamate indicator and iodideHACH CO·Filed 2022·Granted Jul 23, 2024·2 cites·9 claims
- 0395US7698073B2Anti-terrorism water quality monitoring systemHACH CO·Filed 2008·Granted Apr 13, 2010·32 cites·17 claims
- 0493US12210007B2Electrochemical cell stirringHACH CO·Filed 2022·Granted Jan 28, 2025·2 cites·20 claims
- 0591US11549888B2Method for measuring monochloramine in seawaterHACH CO·Filed 2019·Granted Jan 10, 2023·4 cites·8 claims
- 0690USD975562SHandheld meterHACH CO·Filed 2020·Granted Jan 17, 2023·7 cites·1 claims
- 0790USD325638SMicrotester or the likeHACH CO·Filed 1989·Granted Apr 21, 1992·118 cites·1 claims
- 0889USD336444SPortable colorimeterHACH CO·Filed 1990·Granted Jun 15, 1993·36 cites·1 claims
- 0988US9588094B2Water monitoring systemHACH CO·Filed 2014·Granted Mar 7, 2017·6 cites·15 claims
- 1087US6999898B2Classification of deviations in a processHACH CO·Filed 2003·Granted Feb 14, 2006·39 cites·32 claims
- 1187US6538736B1Concentric spectrometer with mitigation of internal specular reflectionsHACH CO·Filed 2000·Granted Mar 25, 2003·40 cites·19 claims
- 1287US5872361ATurbidimeter with non-imaging optical concentratorHACH CO·Filed 1997·Granted Feb 16, 1999·91 cites·21 claims
- 1386US8724107B2Annular optical deviceHACH CO·Filed 2013·Granted May 13, 2014·6 cites·22 claims
- 1486US7789552B2Particulate tester with mixer for analytical applicationHACH CO·Filed 2006·Granted Sep 7, 2010·15 cites·18 claims
- 1585US11422093B2Ultra low range free chlorine measurementHACH CO·Filed 2019·Granted Aug 23, 2022·3 cites·18 claims
- 1685US6315950B1Controlling chlorination of wastewater and chloramination of drinking waterHACH CO·Filed 1998·Granted Nov 13, 2001·74 cites·7 claims
- 1784US12578303B2Electrochemical cell stirringHACH CO·Filed 2024·Granted Mar 17, 2026·0 cites·18 claims
- 1884US11169112B2pH measurement of an aqueous sampleHACH CO·Filed 2019·Granted Nov 9, 2021·2 cites·18 claims
- 1984US10801990B2Alkalinity measurement of an aqueous sampleHACH CO·Filed 2018·Granted Oct 13, 2020·2 cites·10 claims
- 2084US5831727ABubble elimination from liquidHACH CO·Filed 1997·Granted Nov 3, 1998·68 cites·24 claims
- 2183US10890574B2Digestion of lead(0) and subsequent colorimetric detection of lead(II)HACH CO·Filed 2018·Granted Jan 12, 2021·2 cites·18 claims
- 2283US7342506B2Wireless remote monitoring systemHACH CO·Filed 2004·Granted Mar 11, 2008·29 cites·22 claims
- 2383US5506679ANephelometer instrumentHACH CO·Filed 1994·Granted Apr 9, 1996·62 cites·1 claims
- 2482US10794883B2Colorimetric detection of aluminum in an aqueous sampleHACH CO·Filed 2019·Granted Oct 6, 2020·2 cites·20 claims
- 2582US10724984B2SP3 substituted carbon electrode TOC analysis using metallic catalystHACH CO·Filed 2017·Granted Jul 28, 2020·2 cites·8 claims
- 2682US9180449B2Mobile water analysisHACH CO·Filed 2013·Granted Nov 10, 2015·6 cites·16 claims
- 2782US5475486AFlow cell system for turbidimeterHACH CO·Filed 1994·Granted Dec 12, 1995·55 cites·5 claims
- 2882USD333992SPocket colorimeterHACH CO·Filed 1991·Granted Mar 16, 1993·22 cites·1 claims
- 2982US2026002932A1Manganese detectionHACH CO·Filed 2025·Application pending·0 cites
- 3081US11029280B2Alkalinity sensorHACH CO·Filed 2017·Granted Jun 8, 2021·2 cites·9 claims
- 3181US2026049005A1Process, system, and computer readable storage medium for determining optimal coagulant dosageHACH CO·Filed 2025·Application pending·0 cites
- 3280US10718861B2Frequency profiles for non-contact range measurement with multi-scale analysisHACH CO·Filed 2017·Granted Jul 21, 2020·4 cites·11 claims
- 3380US4865992ASystem and method for quantitative analysis of a solutionHACH CO·Filed 1986·Granted Sep 12, 1989·55 cites·22 claims
- 3479USD358448SFlow cell for laboratory turbidimeterHACH CO·Filed 1993·Granted May 16, 1995·21 cites·1 claims
- 3579US5083868AColorimeterHACH CO·Filed 1991·Granted Jan 28, 1992·48 cites·11 claims
- 3678US9476866B2COD/TOC analyses using ferrate oxidationHACH CO·Filed 2014·Granted Oct 25, 2016·3 cites·12 claims
- 3778US7538874B2Measurement of light from a predefined scatter angle from particulate matter in a mediaHACH CO·Filed 2006·Granted May 26, 2009·5 cites·27 claims
- 3878US6512178B2Sliding cover systemHACH CO·Filed 2001·Granted Jan 28, 2003·22 cites·5 claims
- 3978US5604590ANephelometer instrumentHACH CO·Filed 1996·Granted Feb 18, 1997·53 cites·15 claims
- 4077USD1019672SDisplay screen with graphical user interfaceHACH CO·Filed 2021·Granted Mar 26, 2024·6 cites·1 claims
- 4177USD936083SDisplay screen with graphical user interfaceHACH CO·Filed 2020·Granted Nov 16, 2021·7 cites·1 claims
- 4277US10571315B2Single-beam radar level and velocity sensingHACH CO·Filed 2017·Granted Feb 25, 2020·3 cites·20 claims
- 4377US6894778B2Low detection limit turbidimeterHACH CO·Filed 2003·Granted May 17, 2005·20 cites·19 claims
- 4477US6844934B2Optical turbidimeter with a lens tubeHACH CO·Filed 2002·Granted Jan 18, 2005·19 cites·16 claims
- 4577US5707578AMethod for making mold insertsHACH CO·Filed 1996·Granted Jan 13, 1998·46 cites·14 claims
- 4677US2024210381A1Chemistry/instrument parameter color maintenanceHACH CO·Filed 2024·Application pending·0 cites
- 4776US6307630B1Turbidimeter array systemHACH CO·Filed 1999·Granted Oct 23, 2001·42 cites·19 claims
- 4875US4557899AWater-in-oil testing apparatusHACH CO·Filed 1984·Granted Dec 10, 1985·35 cites·17 claims
- 4974US12429480B2Manganese detectionHACH CO·Filed 2022·Granted Sep 30, 2025·0 cites·9 claims
- 5074US10408648B2Flow meter with adaptable beam characteristicsHACH CO·Filed 2016·Granted Sep 10, 2019·1 cites·20 claims
Showing the top 50 of 260 patent records by PatentIndex Score.
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