Inventor

David B. Chang

Inventor

Tustin, CA, US

Overview

98→

Patents

1976–2020

Patent span

Physics

Primary field (CPC G)

Patents· 98 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

A61Nprimary

A61NElectrotherapy11%

A61BDiagnosis11%

A61FFilters implantable into blood vessels10%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests6%

G01NInvestigating or analysing materials by determining their chemical or physical properties6%

G02BOptical elements, systems or apparatus6%

G01FMeasuring volume, volume flow, mass flow or liquid level5%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein4%

G01DMeasuring not specially adapted for a specific variable3%

G01BMeasuring length, thickness or similar linear dimensions3%

PatentTitleYear

10,874,873Process utilizing pulsed energy to heat treat biological tissue2020 10,709,608System and process for prevention of myopia2020 10,709,607System and process for treatment of myopia2020 10,596,389Process and system for utilizing energy to treat biological tissue2020 10,531,908Method for heat treating biological tissues using pulsed energy sources2020 10,434,330Process for safely providing retinal phototherapy based on determination of RPE melanin levels2019 10,363,171System and process for retina phototherapy2019 10,357,398System and process for treatment of myopia2019 10,307,294System and process for neuroprotective therapy for glaucoma2019 10,299,961System for neuroprotective therapy for glaucoma2019 10,285,859System for performing retina photostimulation2019 10,278,863System and process for treatment of myopia2019 10,278,865Process for neuroprotective therapy for glaucoma2019 10,194,798Measuring RPE and choroid melanin levels with reflectometer2019 10,117,777System for neuroprotective therapy for glaucoma2018 9,962,291System and process for neuroprotective therapy for glaucoma2018 9,427,602'Pulsating electromagnetic and ultrasound therapy for stimulating targeted heat shock proteins and facilitating protein repair'2016 9,381,116'Subthreshold micropulse laser prophylactic treatment for chronic progressive retinal diseases'2016 9,168,174'Process for restoring responsiveness to medication in tissue of living organisms'2015 8,574,276'Fiber optic brush for light delivery'2013 8,523,925'Fiber optic phototherapy device'2013 8,337,433'Time-reversed mirroring electro-magnetic acoustic treatment system'2012 8,206,426'Light source and fiber optic brush for light delivery'2012 7,420,195'Frequency-optimized detection of gun muzzle flashes'2008 7,378,188'Storage device and method for sorption and desorption of molecular gas contained by storage sites of nano-filament laded reticulated aerogel'2008 7,372,031'System and method for sensitive photon detection'2008 7,122,008'Blood pressure diagnostic aid'2006 7,114,384'Acoustic adiabatic liquid quantity sensor'2006 6,974,415'Electromagnetic-acoustic imaging'2005 6,906,003'Method for sorption and desorption of molecular gas contained by storage sites of nano-filament laded reticulated aerogel'2005 6,849,855'Method for marking and identifying objects coated with up-conversion material'2005 6,535,625'Magneto-acoustic imaging'2003 6,495,819'Dual-interferometer method for measuring bending of materials'2002 6,463,202'Optimization of curved waveguide design to reduce transmission losses'2002 6,166,815'Constantly high sensitivity fiber optic interferometer sensor'2000 5,531,116'Apparatus and method for phase tomographic determination of fluid currents'1996 5,469,519'Optical waveguide image transmission system and method'1995 5,454,047'Optical method and system for generating expansion coefficients for an image processing function'1995 5,405,680'Selective emissivity coatings for interior temperature reduction of an enclosure'1995 5,361,034'Apparatus for measuring the conductivity of a fluid'1994 5,361,383'Optical fiber having internal partial mirrors and interferometer using same'1994 5,345,522'Reduced noise fiber optic towed array and method of using same'1994 5,311,137'Liquid crystal electric field tester for circuit boards'1994 5,291,032'Fiber optic evanescent wave fuel gauge and leak detector using eccentric core fibers'1994 5,289,266'Noncontact, on-line determination of phosphate layer thickness and composition of a phosphate coated surface'1994 5,270,538'System for accurately detecting changes in temperature and pressure'1993 5,251,482'Low frequency acoustic fuel sensor'1993 5,250,326'Reduction of nonmetallic coating surface vertical irregularities by electrostatic pressure'1993 5,237,281'Ion drag air flow meter'1993 5,235,179'Evanescent wave liquid level sensor with density compensation'1993 5,233,673'Output steerable optical phased array'1993 5,228,856'Optics approach to low side compliance simulation'1993 5,223,763'Wind power generator and velocimeter'1993 5,222,161'Method and apparatus for compressing a light pulse'1993 5,220,180'Fiber optic fuel and liquid gauge having an open rigid \"J\" shaped tube'1993 5,212,583'Adaptive optics using the electrooptic effect'1993 5,210,779'Apparatus and method for focusing hard X-rays'1993 5,208,766'Automated evaluation of painted surface quality'1993 5,179,028'Antibody coated crystal chemical sensor'1993 5,177,970'Refrigerator of air conditioner based on a fluid of electric dipoles'1993 5,165,242'Refrigerator or air conditioner based on a magnetic fluid'1992 5,164,608'Plural wavelength fiber optic liquid level sensor for multiple liquids'1992 5,165,084'System and method for measuring changes in sea level'1992 5,160,634'Desalinization system'1992 5,155,792'Low index of refraction optical fiber with tubular core and/or cladding'1992 5,149,957'Semiconductor-to-metal optical switch for power limitation in the infrared'1992 5,132,831'Analog optical processing for the construction of fractal objects'1992 5,117,676'Leak detector for natural gas pipelines'1992 5,118,932'Shaft rotation rate sensor with a diffraction grating producing a velocity-related beat frequency'1992 5,112,121'Display system for multiviewer training simulators'1992 5,100,230'True ground speed sensor'1992 5,094,758'Desalinization system and method'1992 5,086,972'Enhanced electrostatic paint deposition method and apparatus'1992 5,077,482'Liquid gauge having an optical fiber with flexible membrane enclosure'1991 5,076,662'Electro-optical IFS finder'1991 5,071,209'Variable acuity non-linear projection system'1991 5,072,188'Apparatus for measuring the conductivity of paint spray using an electromagnetic wave'1991 5,058,420'Fiber optic liquid leak detector'1991 5,041,726'Infrared holographic defect detector'1991 5,041,735'Miniature infrared test target'1991 5,033,203'Curing oven using Wellsbach conversion'1991 5,022,040'Upconversion pumped lasers'1991 5,012,499'.gamma.-ray detecting device using dislocation-free crystal'1991 5,009,502'System of holographic optical elements for testing laser range finders'1991 5,005,401'Noncontact on-line measurement of the viscosity of liquid paint'1991 5,004,914'Fiber-optic interferometric chemical sensor'1991 5,003,186'Stratospheric Welsbach seeding for reduction of global warming'1991 4,987,582'X-ray fluorescence imaging of elements'1991 4,986,639'Eye protection device against broadband high intensity light'1991 4,929,841'Dynamic infrared target'1990 4,894,623'Compact tunable RF generator using a current carrying diffraction grating'1990 4,792,683'Thermal technique for simultaneous testing of circuit board solder joints'1988 4,782,494'Method of providing continuous lasing operation'1988 4,773,748'Dynamically controlled mirror for reduction of projected image distortion'1988 4,755,673'Selective thermal radiators'1988 4,727,550'Radiation source'1988 4,575,180'Intrawaveguide fiber optic beamsplitter/coupler'1986 3,942,975'Method and apparatus for reducing matter to constituent elements and separating one of the elements from the other elements'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976Based in Seattle, WA, US· patent location history

1986–2012Patents assigned to CHANG DAVID B (4)· patent assignee history

1986–2020Based in Tustin, CA, US· patent location history

1988–2006Patents assigned to HUGHES AIRCRAFT CO (60)· patent assignee history

2002–2008Patents assigned to SOUTHWEST RES INST (4)· patent assignee history

2012–2013Patents assigned to CHANG DAVID (3)· patent assignee history

2012–2013Based in Encino, CA, US· patent location history

2016–2020Patents assigned to OJAI RETINAL TECH LLC (17)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HUGHES AIRCRAFT CO	60	1988–2006
OJAI RETINAL TECH LLC	17	2016–2020
CHANG DAVID Bself	4	1986–2012
SOUTHWEST RES INST	4	2002–2008
CHANG DAVIDself	3	2012–2013

Locations

Location	Patents	Span
Tustin, California, US	94	1986–2020
Encino, California, US	3	2012–2013
Seattle, Washington, US	1	1976