Successfully Won or Settled 98% of Our Cases

Super Lawyers – Awarded Multiple Years

“Best Law Firm” – The Best Lawyers in America 2019-2024

“Top Attorneys, Southern California” – Los Angeles Magazine

“Top Patent Firms” – IP Today

“Top 10 Law Firms” – Pacific Coast Business Times

“AV Preeminent” – Martindale-Hubbell Highest Ranking

Quality Client Care® Since 1979

Creators of Patentfiler®, Trademarkfiler®, Copyrightfiler®, and Tradesecretfiler® Client User Platforms

Cislo & Thomas LLP is a full-service intellectual property law firm, specializing in patent, copyright, and trademark litigation and providing Quality Client Care® throughout Southern California since 1979.


Our patent experts are prepared to help you in all aspects of Patent Law, including preparation of design, utility, and provisional patent applications, searching, filing, clearance, prosecution, licensing, maintenance, and litigation.

In helping you distinguish your products from those of your competitors, our skilled attorneys are active in all aspects of Trademark Law, including investigations, prosecution, and licensing.

Our attorneys oversee all aspects of Copyright Law and Entertainment Intellectual Property Law, including registration, licensing, enforcement, and litigation, in order to protect all of your written and artistic intellectual property.

Having successfully settled or won over 98% of our cases, our attorneys are experts in all aspects of Intellectual Property Litigation, including patent, trademark, and copyright matters, as well as trade secret misappropriation, idea theft, false advertising, and unfair competition.

Many of our highly experienced IP Attorneys also serve as intellectual property Expert Witnesses in state and federal litigation in California. They also act as third party Mediators and Arbitrators to help resolve intellectual property disputes.

We have successfully set up Trade Secret protection programs for our clients and helped enforce trade secrets, as well as handle trade secret and Unfair Competition litigation matters.

Our lawyers are highly experienced in all aspects of Domain Name enforcement, having handled numerous Uniform Domain Registration Proceedings (UDRP’s).

We address Cybersecurity and Privacy Law, planning, auditing, and defense in order to secure your company’s data privacy and practice General Data Protection Regulation (GDPR) and California Consumer Privacy Act (CCPA) compliance.

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