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About the Authors

C. Wook Pak, Ph. D. (

Education: Dr. Pak received his B.S. in Biochemistry from Oregon State University in 1995; worked as a research associate in the Department of Surgery/Oncology at UCLA; and earned his Ph.D. in Neuroscience from the University of California, Riverside in 2003, where he investigated and published articles regarding the mechanism of resistance to NMDA receptor-mediated excitotoxicity in the rat supraoptic nucleus in vitro.

Dr. Pak received his J.D. from Loyola Law School in 2006, where he received the First Honors Award in Copyright Law.

Admissions: Dr. Pak is admitted to the California Supreme Court, the Central District of California, and the United States Patent and Trademark Office.

Experience: Dr. Pak is currently the Chair of the Patent Prosecution Department at Cislo & Thomas LLP. He is experienced in all aspects of Intellectual Property procurement and enforcement, including preparing and filing U.S. and International patent applications in a variety of technological areas, such as mechanical, pharmaceutical, biotechnological, alternative energy, and business methods. Dr. Pak has prosecuted many U.S. and International applications and is experienced in preparing and filing inter partes and ex partes reexaminations, and preparing legal opinions regarding patentability, patent validity, patent infringement, and freedom to operate.

Dr. Pak has also litigated cases involving allegations of patent infringement and trademark infringement, and successfully negotiated settlements and licensing agreements.

Prior to joining Cislo & Thomas LLP, Dr. Pak worked as a patent intern at Allergan, Inc., and served as a certified law clerk in the Los Angeles County District Attorney’s Office.

Personal Interests: Dr. Pak enjoys spending time and traveling with his family. He also enjoys martial arts, basketball, and skiing and completed the Los Angeles Marathon in 2001.


Kristin Kosinski (

Kristin Kosinski is a partner in Cislo & Thomas LLP’s West Los Angeles office. She focuses her practice in the areas of trademarks, copyrights and domain names, intellectual property litigation and arbitration, and patents and patent prosecution.

LEGAL EXPERIENCE:  Kristin handles trademark branding, licensing and advertising matters for designers, new businesses, and entrepreneurs. While many matters can be resolved without going to court or appearing before an arbitrator, she has experience in litigating and arbitrating trademark and copyright matters including matters concerning commercial diving helmets, vitamin and nutritional supplements, and restaurants. Also, Kristin has experience preparing and prosecuting patent applications in various types of subject matter, including wearable devices, innovative mechanical apparati, over the counter consumer care products including beauty products, cosmetics, hair preparations, and nutritional items, and biotechnology.


“Fashion and Apparel Licensing,” Chapter in Fashion Law: A Guide for Designers, Fashion Executives, and Attorneys, pp. 81-104 (2009) (Barbara Kolsun, Kristin B. Kosinski)

“Hatch-Waxman in the Federal Courts: 1994-2004,” Drug Development and Industrial Pharmacy, 31(2): 15-22 (2005) (S. Peter Ludwig, Kristin B. Kosinski)

“Generic Drug Approval: Post 1984; Hatch-Waxman Reform,” Chapter in Introduction to the Pharmaceutical Regulatory Process, I. Berry, Editor (2005) (S. Peter Ludwig, Marc Gross, Atul Singh, Kristin B. Kosinski)

“Patents and Polymorphs” Chapter in Biotechnology and Pharmaceutical Law 2004: Patents and Business Strategies, Practising Law Institute Intellectual Property Course Handbook Series (S. Peter Ludwig, Kristin B. Kosinski)

“Playing by the Orange Book Listing Rules in View of Recent Hatch-Waxman Reforms,” Food Drug L. Reg. and Educ. 10 (2004)

“Research Tool Patents and the Section 271(e)(1) Exemption,” Chapter in Biotechnology Law 2003: Biotechnology Patents & Business Strategies, Practicing Law Institute Intellectual Property Course Handbook Series (Robert C. Sullivan, Kristin B. Kosinski)

Discovering Drugs in Patent File Histories, Food Drug L. Reg. and Educ. 12 (2003)

The Hatch-Waxman Act: Balancing Competing Interests or Survival of the Fittest? 52 Food Drug L. J. 247 (2002)

Cancellation of the Washington Redskins’ Federal Trademark Registrations: Should Sports Team Names, Mascots, and Logos Contain Native American Symbolism? 10 Seton Hall J. Sports L. 289 (2000)

COURT ADMISSIONS:  U.S. Court of Appeals for the Ninth Circuit;  U.S. District Court for the Central District of California;  U.S. District Court for the Southern District of California; California

Kristin is also admitted to practice in New York and New Jersey, and before the U.S. Patent and Trademark Office


Seton Hall University School of Law, J.D., 2001

Drew University, B.A., magna cum laude, Biology, 1997

Stanford University, 1993-4


About Cislo & Thomas LLP

Cislo & Thomas LLP does a vast amount of patent, trademark and copyright application and prosecution work. We take on all types of technological issues. Recently, the firm has filed and prosecuted domestic and international patents in various mechanical applications, automotive components, optical wave conjugation, optic arrangements, computer applications, electromechanical apparatuses, aerospace advanced electronics, exercise equipment and varied chemical compositions. Trademark and copyright applications have also been filed and successfully prosecuted throughout the United States and the world.

With our brilliant lawyers, the firm handles a substantial amount of litigation in the Federal and State Trial Courts of California. In recent years, we have successfully litigated cases through trial or obtained summary judgments or injunctive relief to the benefit of our clients. Several of these decisions can be found in the United States Patents Quarterly Reporter or the Federal Reporters. The firm has also successfully handled a number of appeals to the United States Courts of Appeal for both the Ninth Circuit and the Federal Circuit.

Our work entails counseling clients seeking to obtain patent, trademark, copyright and trade secret protection, and looking to enforce these rights in court when they are violated. We advise our clients how to avoid infringing on the intellectual property rights of others, as well as protecting them from those who might infringe upon theirs.

Typically, we begin by performing patent, copyright and trademark availability searches and opinions to advise clients whether they should proceed with their project. We can then file and prosecute patent, copyright or trademark applications through the respective government offices.

We work directly with the United States Patent & Trademark Office, the United States Copyright Office, the U.S. Department of Customs, and Federal Courts throughout the United States. We also work with patent and trademark offices throughout the world through our foreign associates.

Using our unique Intellectual Property Cost Control™ or IPCC™ methods we can provide quality patent, trademark and copyright filing, licensing and prosecution at reasonable costs which are at or below the median expected costs as reported by American Intellectual Property Law Association.

Cislo & Thomas LLP’s story begins in 1970 when Donald M. Cislo, a patent attorney from Chicago, Illinois, decided to leave the Midwest cold and venture west. Having earned his chemical engineering degree from ITT, and going to night law school at DePaul, Don decided that intellectual property would be extremely important in Southern California. Passing up a great opportunity at Hughes Aircraft, Don liked his prospects better at a small patent firm in Santa Monica, even if it meant less money.

Chuck Thomas also studied electrical engineering in Illinois and, in fact, attended DePaul Law School several years after Don. They formed their two-attorney partnership in 1979, and have faithfully served the Southland’s inventors and small businesses as California has grown into an innovative powerhouse.

Dan Cislo grew up with a special fondness for science, reading Scientific American when other kids were reading the sports pages. He went to UCLA and graduated with a degree in Systems Engineering – a combination of electrical and mechanical engineering with computer science. Like his Dad, he went on to study law at night while engineering by day. With a strong background in engineering, and a law degree from Loyola Law School, he went to work for a prominent downtown intellectual property law firm.

Dan also started a company, SecureCase Co., around the same time, developing and manufacturing patented locking cases for firearms, still used by the military, FBI and law enforcement agencies throughout the world. In 1986, Don wanted to grow the Cislo & Thomas practice, and made Dan an offer he could not refuse. Dan became the managing partner in 1996 and has never looked back, loving the wonders of science, the possibilities of technology and the excitement of business.

The firm has grown, technology has changed, and the speed of business has increased. Yet, the firm continues to focus on an integrated approach to protecting, licensing and litigating patent, copyright, trademark and trade secret matters. Few firms can match Cislo & Thomas’ Quality Client Care® (QCC®) approach, which requires IP specialists who know engineering and science as well as litigation and business strategies. The firm is not only AV rated by Martindale-Hubble (the highest rating that can be received), but also listed in the Bar Register of Preeminent Lawyers, which places the firm in the top 5% of law firms nationwide.

With offices in West Los Angeles, Westlake Village/Thousand Oaks and Santa Barbara, California, the firm’s patent attorneys serve the greater Southern California area, including Los Angeles, Ventura, and Orange Counties. We work in all aspects of patent, trademark, copyright, trade secret and domain name law. Our lawyers have the technical training and experience to handle any matter, and excel in searching, clearing, filing, licensing, maintaining and litigating of intellectual property matters. Our local offices provide a convenient venue to meet our attorneys and discuss how we can best protect your intellectual property.  Alternatively, if you live in a different area, we can also schedule a live web-consultation with you.