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CHUANWEN JI
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IRVINE, CA, US
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Patents Grants
last 30 patents
Information
Patent Grant
Data storage device integrating wedge repeatable runout (WRRO) lear...
Patent number
11,790,949
Issue date
Oct 17, 2023
Western Digital Technologies, Inc.
Jim French
G11 - INFORMATION STORAGE
Information
Patent Grant
Per head, per profile finalize to move repeatable runout compensati...
Patent number
11,482,253
Issue date
Oct 25, 2022
Western Digital Technologies, Inc.
Zaifeng Chen
G11 - INFORMATION STORAGE
Information
Patent Grant
Repeatable runout compensation value generation
Patent number
11,456,014
Issue date
Sep 27, 2022
Western Digital Technologies, Inc.
Zaifeng Chen
G11 - INFORMATION STORAGE
Information
Patent Grant
Data storage device computing notch filters for multiple temperatures
Patent number
10,629,234
Issue date
Apr 21, 2020
Western Digital Technologies, Inc.
Hengchang Guo
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Disk drive measuring stroke difference between heads by detecting a...
Patent number
9,355,666
Issue date
May 31, 2016
Western Digital Technologies, Inc.
Yanan Huang
G11 - INFORMATION STORAGE
Information
Patent Grant
Electronic system with media scan mechanism and method of operation...
Patent number
9,349,401
Issue date
May 24, 2016
Western Digital Technologies, Inc.
Alexander Babinski
G11 - INFORMATION STORAGE
Information
Patent Grant
Data storage device demodulating servo burst by computing slope of...
Patent number
9,286,927
Issue date
Mar 15, 2016
Western Digital Technologies, Inc.
Shan Tang
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive characterizing microactuator by injecting sinusoidal dis...
Patent number
9,142,235
Issue date
Sep 22, 2015
Western Digital Technologies, Inc.
Alexander Babinski
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive detecting microactuator degradation by evaluating freque...
Patent number
8,929,022
Issue date
Jan 6, 2015
Western Digital Technologies, Inc.
Yanan Huang
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive releasing variable amount of buffered write data based o...
Patent number
8,922,931
Issue date
Dec 30, 2014
Western Digital Technologies, Inc.
Chuanwen Ji
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive evaluating multiple vibration sensor outputs to enable w...
Patent number
8,922,937
Issue date
Dec 30, 2014
Western Digital Technologies, Inc.
Alain Chahwan
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive reducing write unsafe threshold when detecting an unreco...
Patent number
8,913,338
Issue date
Dec 16, 2014
Western Digital Technologies, Inc.
Alain Chahwan
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive predicting spindle motor failure by evaluating current d...
Patent number
8,804,267
Issue date
Aug 12, 2014
Western Digital Technologies, Inc.
Yanan Huang
G11 - INFORMATION STORAGE
Information
Patent Grant
Polarity detection of piezoelectric actuator in disk drive
Patent number
8,797,664
Issue date
Aug 5, 2014
Western Digital Technologies, Inc.
Hengchang Guo
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive performing lifetime logging of microactuator sensitivity
Patent number
8,605,384
Issue date
Dec 10, 2013
Western Digital Technologies, Inc.
Yanning Liu
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive correcting track ID in response to an estimated radial l...
Patent number
8,553,351
Issue date
Oct 8, 2013
Western Digital Technologies, Inc.
Aswartha Narayana
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive detecting crack in microactuator
Patent number
8,335,049
Issue date
Dec 18, 2012
Western Digital Technologies, Inc.
Yanning Liu
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive initializing a coil temperature estimation algorithm usi...
Patent number
7,660,067
Issue date
Feb 9, 2010
Western Digital Technologies, Inc.
Chuanwen Ji
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive estimating angular position of spindle motor during spin...
Patent number
7,253,582
Issue date
Aug 7, 2007
Western Digital Technologies, Inc.
Jianghong Ding
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive employing a velocity profile and back EMF feedback to co...
Patent number
7,068,463
Issue date
Jun 27, 2006
Western Digital Technologies, Inc.
Chuanwen Ji
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive disabling BEMF detection window to reduce acoustic noise...
Patent number
6,954,324
Issue date
Oct 11, 2005
Western Digital Technologies, Inc.
Kuang-Yang Tu
G11 - INFORMATION STORAGE
Information
Patent Grant
Disk drive employing BEMF spindle speed control or wedge spindle sp...
Patent number
6,914,740
Issue date
Jul 5, 2005
Western Digital Technologies, Inc.
Kuang-Yang Tu
G11 - INFORMATION STORAGE
Patents Applications
last 30 patents
Information
Patent Application
DATA STORAGE DEVICE INTEGRATING WEDGE REPEATABLE RUNOUT (WRRO) LEAR...
Publication number
20230282237
Publication date
Sep 7, 2023
Western Digital Technologies, Inc.
Jim French
G11 - INFORMATION STORAGE
Information
Patent Application
DISK DRIVE PREDICTING SPINDLE MOTOR FAILURE BY EVALUATING CURRENT D...
Publication number
20140126081
Publication date
May 8, 2014
WESTERN DIGITAL TECHNOLOGIES, INC.
YANAN HUANG
G11 - INFORMATION STORAGE