the firm's post-grant practitioners are some of the most experienced in the country.


Artificial Intelligence (AI)
Artificial Intelligence (AI)
Digital Health
Digital Health
Energy & Renewables
Energy & Renewables

Fast Facts

About Our

Law Firm

About Our Law Firm

Headquartered within steps of the USPTO with an affiliate office in Tokyo, Oblon is one of the largest law firms in the United States focused exclusively on intellectual property law.

Get to know our


Get to know our History

Norman Oblon with Stanley Fisher and Marvin Spivak launched what was to become Oblon, McClelland, Maier & Neustadt, LLP, one of the nation's leading full-service intellectual property law firms.

Our Local and

Global Reach

Our Local and Global Reach

Outside the US, we service companies based in Japan, France, Germany, Italy, Saudi Arabia, and farther corners of the world. Our culturally aware attorneys speak many languages, including Japanese, French, German, Mandarin, Korean, Russian, Arabic, Farsi, Chinese.

A few of our


A few of our ACCOLADES

Oblon's professionals provide industry-leading IP legal services to many of the world's most admired innovators and brands.




From the minute you walk through our doors, you'll become a valuable part of a team that fosters a culture of innovation, client service and collegiality.

A few ways to

GET In Touch

A few ways to GET In Touch
US Office

Telephone: 703-413-3000
Learn More +

Tokyo Office

Telephone: +81-3-6212-0550
Learn More +


Patent Forms

Downloadable Patent Forms

The United States Patent and Trademark Office (USPTO) issued final rules implementing the inventor's oath or declaration provisions of the America Invents Act (AIA) on August 14, 2012.

Hanjun  Liu

Hanjun Liu

Patent Agent
T: 703-412-2928
F: 703-413-2220
Download Summary PDF
Download Detailed PDF

Hanjun Liu is a Patent Agent in the firm’s Electrical Patent Prosecution Practice Group providing legal service to clients in the areas of patent prosecution and PTAB litigation. Mr. Liu prosecutes patent application for clients from an extensive range of arts, including semiconductor devices, software, mobile technology and mechanical systems.

Mr. Liu has expertise in semiconductor fabrication, MEMS, photovoltaics, automobile technologies and analog/digital circuits. Mr. Liu has research experience in fabrication and design of multiple layer organic solar cells. His research focuses on improving organic solar cells’ efficiency by using light trapping techniques.

Prior to law school, Mr. Liu was a founder of a start-up company and during law school, Mr. Liu was involved in the Patent Law Clinic. He supported the Clinic’s clients, including handling Office Action responses, generating patentability reports, and drafting patent applications. 


  • New York Law School (J.D.)
  • Columbia University (M.S.)
    • Electrical Engineering
  • Xidian University (B.S.)
    • Microelectronics


  • Registered to practice before the U.S. Patent and Trademark Office