Josephine E. Chang

Josephine E. Chang

Partner vCard
626.577.8800 fax
655 North Central Avenue
Suite 2300
Glendale, CA 91203

Josephine Chang is a partner in Lewis Roca Rothgerber Christie’s Intellectual Property practice group. Clients turn to Josephine for managing small and large patent portfolios, to conduct in-depth evaluations of products and processes for patentability and infringement, conduct right to use evaluations, and obtain advice for other IP matters in the U.S. and abroad. She has extensive international experience with patent filings across Europe and Asia, including Korea, Japan, China, Australia, and Canada. As a member of the firm’s Korea Practice Team, Josephine has provided IP services to Korean clients in both the U.S. and abroad. Josephine has also represented other international clients, including clients in Japan and Europe. She is experienced in managing large patent portfolios as well as working with start-up companies and individual inventors. Josephine also represents universities in their patent matters. In addition to domestic and foreign patent prosecution, Josephine procures and counsels clients with respect to trademarks and copyrights.

Josephine has technical expertise in computer software and hardware, telecommunications, and customer contact centers systems, among others. She uses this background in counseling clients and preparing and prosecuting patent applications in these technical areas.

Professional Experience

  • Lewis Roca Rothgerber Christie (legacy firm Christie Parker & Hale LLP), Partner, 2007-present 
  • Lewis Roca Rothgerber Christie (legacy firm Christie Parker & Hale LLP), Associate, 1997-2000


  • Korean
  • Spanish

Memberships & Affiliations

  • Los Angeles Intellectual Property Bar Association, Member, 1998
  • Korean American Bar Association, Member, 2006

Representative Matters

Josephine has assisted clients with patent prosecution relating to many areas, including but not limited to customer contact center and call distribution systems, telecommunication networks and protocols, sensors, medical imaging technology, data storage, archiving, and management, Internet/Web 2.0 technologies, cloud and SaaS based technologies, visual navigation systems, business method technologies, consumer electronics, 3D/2D image processing, gaming, point-of-sale systems, and interactive television technologies.

Patent Prosecution Experience

Artificial Intelligence / Machine Learning 

  • Developing Complex Probabilistic Models
  • Extracting Domain Model for Dynamic Dialog Control

Computer Networks (user authentication, VLAN, QoS, network processors, resource management, cloud computing, peer-to-peer, network analysis) 

  • Resource Sharing in a Peer-to-Peer Network
  • Hybrid Cloud Architecture
  • Modeling and Analyzing Data via Hierarchical Random Graphs

Medical Devices / Systems (medical care management; surgical systems)

  • Longitudinal Member for Spinal Surgery
  • Bone Anchoring Element


  • Media Compression/Decompression
  • Media Transfer Protocol

Network Security (encryption/decryption)

  • Stream Cipher Encryption/Decryption
  • Cryptography Engine

Computer Modeling and Analysis

  • Chemical Release Estimation
  • Monitoring and Managing Utility Devices

Medical Imaging / Image Processing 

  • Locating Anatomies of Interest in 3D Imaging
  • Distributing and Displaying Still Photos
  • Creating, Storing, and Utilizing Composite Images 

Data Analysis and Database Management

  • Searchable Archive
  • Representing Unstructured Data

Computer Animation

  • Streaming 3D Animated Content
  • Optimizing 3D Animation and Textures

Internet of Things

Telecommunications (Signaling protocols, automated call distribution systems)


Computer Forensics

Interactive Television

Interactive Games and Gaming Devices

Music (playlist recommendation; audio data analysis)



Other Info


J.D., Loyola University Chicago School of Law, 1996
B.S., Carnegie-Mellon University, 1993, Mathematics/Computer Science and Spanish

Bar Admissions

California, 1997
Illinois, 1996

Court Admissions

U.S. Patent and Trademark Office, 2000