Inventor
Ellis Cha
Inventor
San Ramon, CA, US
Overview
Patents· 67 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G11Bprimary
G11BInformation storage based on relative movement between record carrier and transducer67%
Y10TTechnical subjects covered by former us classification11%
H05KPrinted circuits4%
B24BMachines, devices, or processes for grinding or polishing3%
B24DTools for grinding, buffing or sharpening3%
C23CCoating metallic material3%
Y02PClimate change mitigation technologies in the production or processing of goods3%
B82YSpecific uses or applications of nanostructures2%
B62DMotor vehicles1%
F16CShafts1%
PatentTitleYear
11,114,121Air-bearing surface (ABS) design to reduce particle scratch risk202110,839,843TD detection with enhanced HDIs signal202010,811,046Air-bearing surface (ABS) design to reduce particle scratch risk202010,679,653High power ratio mode for TAMR drives202010,629,233Bumper pad design for TAMR drives202010,360,935Dual write heater for slider surface topography control in double perpendicular magnetic recording (PMR) writers20199,940,960Air-bearing design for hydrocarbon and lube pick-up improvements in hard disk drive (HDD)20189,892,746'ABS design with soft bumper pads (SBP) for mitigating media damage and thermal erasure in hard disk drives (HDD)'20189,251,829'Head DFH protrusion shape calibration by HDI sensor'20168,976,481'Touch down detection with HDI sensor DC mode'20158,867,172'ABS design for uniform touch-down and back-off in DFH applications'20148,767,339'Spacing fluctuation compensation'20148,717,702'Measurement of spacing fluctuation'20148,576,671'ABS design with multiple heaters'20138,274,751'Electrical current as probe for modulation at head-disk interface'20128,218,269'Gimbal mounted slider assembly with ramp limiter transverse bar'20128,184,405'Air-bearing slider design for sub-nanometer clearance in hard disk drive (HDD)'20128,139,306'Electrical current as probe for modulation at head-disk interface'20128,054,585'Gimbal with assymmetric dynamic stiffness'20118,045,295'Method and apparatus for providing an additional ground pad and electrical connection for grounding a magnetic recording head'20118,027,127'Method of reducing slider roll torque by balancing head gimbal assembly for improved seeking performance'20118,018,682'Magnetic disk comprising an aluminum alloy oxynitride underlayer and a diamond-like carbon overcoat'20118,014,104'Magnetic head/disk with transition metal oxynitride adhesion/corrosion barrier and diamond-like carbon overcoat bilayer'20118,009,387'Forming an aluminum alloy oxynitride underlayer and a diamond-like carbon overcoat to protect a magnetic recording head and/or media'20118,000,061'Gimbal mounted slider assembly with transverse bars connecting inner edges of ramp limiter arms'20117,978,436'Air bearing surface with higher flying height for lower rotating speed drives'20117,969,685'ABS design for dynamic flying height (DFH) applications'20117,961,433'Air-bearing design for hard disk drive (HDD) applications'20117,957,104'Suspension with bi-layer flexure base whose layers have different coefficients of thermal expansion to eliminate thermally induced flying height variations'20117,907,368'Balanced head gimbal assembly for improved seeking performance'20117,894,162'Method to protect the magnetic recording head from thermal asperities during disk drive operation'20117,885,040'Suspension with locally strengthened gimbal'20117,837,885'Air bearing design with a flatter pitch profile for reducing particle TAs'20107,782,569'Magnetic recording head and media comprising aluminum oxynitride underlayer and a diamond-like carbon overcoat'20107,760,468'Air-bearing design with particle rejection features'20107,701,672'Suspension with locally stiffened load beam'20107,684,154'Suspension gimbal designs with better dynamic performances'20107,679,857'Non-contact measurement of slider fly height by electrostatic force'20107,675,711'Measuring and neutralizing the electrical charge at the interface of a magnetic head and media'20107,617,737'Adjustment of pitch and roll static torques in a disk drive head gimbal assembly'20097,506,552'Micro torque and micro stiffness measurement device'20097,468,196'Measuring and neutralizing the electrical charge at the interface of a magnetic head and media'20087,460,336'Slider design including stiction reduction pads'20087,460,342'Method to form tapered magnetic shield for perpendicular recording head'20087,440,219'Non-contact measurement of slider fly height by electrostatic force'20087,433,156'Flexure for minimizing fly height modulation of near-contact recording sliders in a disk drive'20087,391,594'Apparatus for providing an additional ground pad and electrical connection for grounding a magnetic recording head'20087,357,875'Hybrid coating for magnetic heads'20087,342,750'Method for providing electrical crossover in a laminated structure'20087,327,535'Hybrid coating for magnetic heads'20087,233,460'Ultra-low flying height slider design'20077,092,213'Multiple level surface configuration for a sub-ambient pressure air bearing slider'20067,085,083'Method for testing a micro-actuator in a magnetic tester'20067,064,928'Method and apparatus for providing an additional ground pad and electrical connection for grounding a magnetic recording head'20067,046,473'Method and apparatus for active fly height control with heating and electrical charge'20067,042,670'Method for adjusting flying height of magnetic heads using an electrical charge through an electrical pad on the slider'20066,989,671'Detection of slider-disk interference using a dynamic parametric test'20066,943,989'Subambient pressure slider with partitioned subambient area'20056,831,814'Flexure design providing improved lift-off in a disk drive'20046,765,758'Subambient pressure slider including secondary structures in the subambient area'20046,034,842'Subambient pressure slider for constant flying height'20006,014,288'Partially etched protective overcoat for a disk drive slider'20005,985,163'Partially etched protective overcoat for a disk drive slider'19995,739,981'Magnetic head sub-ambient air pressure slider for a disk drive device or the like'19985,677,808'System and method for controlling a seek operation in a disk drive'19975,677,812'Air bearing slider with variable sub-ambient pressure control'19975,497,085'Method for determining an outer diameter rolloff in a process for making magnetic disks'1996Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1996–2000Based in Santa Clara, CA, US· patent location history
2000–2021Patents assigned to SAE MAGNETICS HK LTD (59)· patent assignee history
2004–2008Based in San Jose, CA, US· patent location history
2006–2021Based in San Ramon, CA, US· patent location history
2008–2016Patents assigned to HEADWAY TECHNOLOGIES INC (6)· patent assignee history
2012–2016Patents assigned to CHA ELLIS (6)· patent assignee history
2012–2016Patents assigned to ZENG QINGHUA (4)· patent assignee history
2016Based in San Bernardino, CA, US· patent location history
2018–2021Patents assigned to HEADWAY TECH INC (8)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SAE MAGNETICS HK LTD | 59 | 2000–2021 |
| HEADWAY TECH INC | 8 | 2018–2021 |
| CHA ELLISself | 6 | 2012–2016 |
| HEADWAY TECHNOLOGIES INC | 6 | 2008–2016 |
| ZENG QINGHUA | 4 | 2012–2016 |
Locations
| Location | Patents | Span |
|---|---|---|
| San Ramon, California, US | 53 | 2006–2021 |
| Santa Clara, California, US | 7 | 1996–2000 |
| San Jose, California, US | 6 | 2004–2008 |
| San Bernardino, California, US | 1 | 2016 |