Inventor · disambiguated record
Richard K. Defreez
Also filed as: DEFREEZ RICHARD · DEFREEZ RICHARD K · DEFREEZE RICHARD K
24 granted patents·3 pending applications·660 citations·filing 1980–2017
97Inventor score
Files withPACIFIC SCIENT INSTR COMPANY6ELECTRO SCIENT IND INC5MET ONE INC4HACH ULTRA ANALYTICS INC3OREGON GRADUATE CENTER3
Top patents by PatentIndex Score
27 records- 0194US7173257B1Integrated assembly for delivery of air stream for optical analysisHACH ULTRA ANALYTICS INC·Filed 2005·Granted Feb 6, 2007·34 cites·32 claims
- 0289US6784990B1Particle detection system implemented with a mirrored optical systemPACIFIC SCIENT INSTR COMPANY·Filed 2003·Granted Aug 31, 2004·35 cites·19 claims
- 0385US5317447AHigh-power, compact, diode-pumped, tunable laserELECTRO SCIENT IND INC·Filed 1992·Granted May 31, 1994·51 cites·31 claims
- 0483US6016194AParticles counting apparatus and method having improved particle sizing resolutionPACIFIC SCIENT INSTR COMPANY·Filed 1998·Granted Jan 18, 2000·65 cites·18 claims
- 0579US6137572AHigh sensitivity optical fluid-borne particle detectionPACIFIC SCIENT INSTR COMPANY·Filed 1998·Granted Oct 24, 2000·57 cites·20 claims
- 0679US5642193AParticle counter employing a solid-state laser with an intracavity view volumeMET ONE INC·Filed 1996·Granted Jun 24, 1997·42 cites·20 claims
- 0778US7355706B2Particle detection system implemented with an immersed optical systemHACH ULTRA ANALYTICS INC·Filed 2005·Granted Apr 8, 2008·6 cites·18 claims
- 0876US5946093AParticle detection system and method employing an upconversion laserMET ONE INC·Filed 1998·Granted Aug 31, 1999·45 cites·33 claims
- 0976US5864399AMethod for counting particles in a fluent streamMET ONE INC·Filed 1997·Granted Jan 26, 1999·36 cites·6 claims
- 1075US5946092ADual laser heterodyne optical particle detection techniquePACIFIC SCIENT INSTR COMPANY·Filed 1998·Granted Aug 31, 1999·46 cites·20 claims
- 1173US6061132ADual detector array with noise cancellation for a particle size detection devicePACIFIC SCIENT INSTR COMPANY·Filed 1998·Granted May 9, 2000·41 cites·12 claims
- 1273US5590141AMethod and apparatus for generating and employing a high density of excited ions in a lasantELECTRO SCIENT IND INC·Filed 1994·Granted Dec 31, 1996·30 cites·24 claims
- 1373US5260963AMethod and apparatus for efficient operationof a solid-state laser optically pumped by an unstable resonator semiconductor laserELECTRO SCIENT IND INC·Filed 1992·Granted Nov 9, 1993·30 cites·26 claims
- 1470US8284398B2Nephelometer with concentration-modulated sample flowDEFREEZ RICHARD K·Filed 2010·Granted Oct 9, 2012·3 cites·16 claims
- 1568US6111642AFlow apertured intracavity laser particle detectorPACIFIC SCIENT INSTR COMPANY·Filed 1998·Granted Aug 29, 2000·32 cites·12 claims
- 1668US5323414ALaser system and method employing a nonimaging concentratorELECTRO SCIENT IND INC·Filed 1992·Granted Jun 21, 1994·24 cites·42 claims
- 1766US4796269ATwo-dimensional phase-locked surface emitting semiconductor laser arrayOREGON GRADUATE CENTER·Filed 1987·Granted Jan 3, 1989·16 cites·7 claims
- 1865US7659523B1Integrated assembly for delivery of air stream for optical analysisHACH ULTRA ANALYTICS INC·Filed 2006·Granted Feb 9, 2010·1 cites·11 claims
- 1958US5559824AOptical frequency-converting medium pumped by unstable resonator semiconductor laserELECTRO SCIENT IND INC·Filed 1994·Granted Sep 24, 1996·17 cites·50 claims
- 2057US4698129AFocused ion beam micromachining of optical surfaces in materialsOREGON GRADUATE CENTER·Filed 1986·Granted Oct 6, 1987·24 cites·4 claims
- 2152US2005024641A1Particle detection systemFiled 2004·Application pending·0 cites
- 2251US2011314937A1System and method for the optical detection of aerosolsJOHNSON ROBERT·Filed 2009·Application pending·0 cites
- 2350US5903347AParticle counter employing a chromium based solid-state laser with an intracavity view volumeMET ONE INC·Filed 1997·Granted May 11, 1999·11 cites·6 claims
- 2447US10365199B2Twin-spot light absorbing particulate monitoring instrumentMET ONE INSTR INC·Filed 2017·Granted Jul 30, 2019·0 cites·19 claims
- 2547US2009293646A1System and method for optical detection of aerosolsJOHNSON ROBERT·Filed 2007·Application pending·0 cites
- 2646US4797892ALongitudinally coupled surface emitting semiconductor laser arrayOREGON GRADUATE CENTER·Filed 1987·Granted Jan 10, 1989·7 cites·5 claims
- 2737US4362388ARemote measurement of concentration of a gas specie by resonance absorptionBETHLEHEM STEEL CORP·Filed 1980·Granted Dec 7, 1982·7 cites·12 claims
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