Inventor
Richard K. DeFreez
Inventor
Azalea, OR, US
Overview
Patents· 24 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G01Nprimary
G01NInvestigating or analysing materials by determining their chemical or physical properties57%
H01SDevices using the process of light amplification by stimulated emission of radiation [laser] to amplify or generate light29%
G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein11%
H10PGeneric processes or apparatus for the manufacture or treatment of devices covered by class h104%
PatentTitleYear
10,365,199Twin-spot light absorbing particulate monitoring instrument20198,284,398'Nephelometer with concentration-modulated sample flow'20127,659,523'Integrated assembly for delivery of air stream for optical analysis'20107,355,706'Particle detection system implemented with an immersed optical system'20087,173,257'Integrated assembly for delivery of air stream for optical analysis'20076,784,990'Particle detection system implemented with a mirrored optical system'20046,137,572'High sensitivity optical fluid-borne particle detection'20006,111,642'Flow apertured intracavity laser particle detector'20006,061,132'Dual detector array with noise cancellation for a particle size detection device'20006,016,194'Particles counting apparatus and method having improved particle sizing resolution'20005,946,093'Particle detection system and method employing an upconversion laser'19995,946,092'Dual laser heterodyne optical particle detection technique'19995,903,347'Particle counter employing a chromium based solid-state laser with an intracavity view volume'19995,864,399'Method for counting particles in a fluent stream'19995,642,193'Particle counter employing a solid-state laser with an intracavity view volume'19975,590,141'Method and apparatus for generating and employing a high density of excited ions in a lasant'19965,559,824'Optical frequency-converting medium pumped by unstable resonator semiconductor laser'19965,323,414'Laser system and method employing a nonimaging concentrator'19945,317,447'High-power, compact, diode-pumped, tunable laser'19945,260,963'Method and apparatus for efficient operationof a solid-state laser optically pumped by an unstable resonator semiconductor laser'19934,797,892'Longitudinally coupled surface emitting semiconductor laser array'19894,796,269'Two-dimensional phase-locked surface emitting semiconductor laser array'19894,698,129'Focused ion beam micromachining of optical surfaces in materials'19874,362,388'Remote measurement of concentration of a gas specie by resonance absorption'1982Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1982Based in Beaverton, OR, US· patent location history
1987–1989Patents assigned to OREGON GRADUATE CENTER (3)· patent assignee history
1987–1999Based in Hillsboro, OR, US· patent location history
1993–1996Patents assigned to ELECTRO SCIENT IND INC (5)· patent assignee history
1997–1999Patents assigned to MET ONE INC (4)· patent assignee history
1999–2004Patents assigned to PACIFIC SCIENT INSTR COMPANY (6)· patent assignee history
1999–2019Based in Azalea, OR, US· patent location history
1999Based in Grants Pass, OR, US· patent location history
2007–2010Patents assigned to HACH ULTRA ANALYTICS INC (3)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| PACIFIC SCIENT INSTR COMPANY | 6 | 1999–2004 |
| ELECTRO SCIENT IND INC | 5 | 1993–1996 |
| MET ONE INC | 4 | 1997–1999 |
| HACH ULTRA ANALYTICS INC | 3 | 2007–2010 |
| OREGON GRADUATE CENTER | 3 | 1987–1989 |
Locations
| Location | Patents | Span |
|---|---|---|
| Azalea, OR, US | 12 | 1999–2019 |
| Hillsboro, OR, US | 10 | 1987–1999 |
| Grants Pass, OR, US | 1 | 1999 |
| Beaverton, OR, US | 1 | 1982 |