Firm / Organisation

Leydig, Voit & Mayer, Ltd

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President: John Kilyk, Jr.
Vice President: Mark J. Liss
Treasurer: Steven P. Petersen
Secretary: Aaron R. Feigelson
Number of US partners: 45 Number of other US lawyers: 30

Firm Overview:
Leydig, Voit & Mayer has a singular focus: the practice of intellectual property law. The firm provides intellectual property litigation, prosecution, counseling, and licensing services to a wide range of clients worldwide, from multinational corporations to start-ups. Leydig offers deep litigation and technical expertise in areas critical to business today, including pharmaceuticals, chemistry, electronics, software, computers, manufacturing, biotechnology, and business methods. Founded in 1893, the firm has over 70 attorneys and technical advisors, along with over 100 staff professionals working in five offices in the US and Germany.

Main Areas of Practice:  

Intellectual Property Litigation:
Throughout its rich history, Leydig has been at the forefront of IP litigation. That tradition continues to this day. Leydig’s distinguished and successful courtroom performance derives from its knowledgeable and experienced attorneys. The strength of legal and technical experience of the firm’s attorneys enables the firm to tailor its services to the unique litigation needs of each client.

Patent Practice:
At Leydig, patent prosecution standards are exacting. The firm recognizes that the patent itself is the most critical document in patent enforcement and valuation, and works diligently to obtain the best possible protection for each of its clients’ inventions. While quality is paramount, Leydig also consistently ranks among the top performers for number of patents prosecuted on behalf of clients worldwide. For international services, Leydig has cultivated an extensive international network of foreign associates, which allows the firm to quickly and efficiently prepare and prosecute patent applications throughout the world, while remaining up to date on the changes in patent law in every country.

Trademark Practice:
Leydig’s trademark services include assisting in name and mark selection, licensing, and counseling — in traditional media, in software, and on the Internet. The firm also handles all phases of trademark enforcement including pre-lawsuit negotiations and litigation before state and federal courts, as well as proceedings before the Trademark Trial and Appeal Board.

Additional IP Areas:
Clients rely on Leydig for experience in related areas such as antitrust, unfair competition, trade secret misappropriation, internet domain name disputes, trade libel, entertainment, deceptive trade practices, interference with customer relations, employee pirating, and civil RICO charges.

Representative Clients:  

Agfa-Gevaert NV:
Leydig represents Agfa-Gevaert NV and related companies, which develop, produce, and distribute graphics, healthcare, and specialty products. Leydig handles patent litigation and opinion work and advises Agfa on various other aspects of IP law.

American International Group:
American International Group is a leading global insurance organization, serving millions of commercial, institutional, and individual customers in more than 80 countries and jurisdictions. Leydig works to clear, enforce, and defend AIG’s trademarks worldwide.

Caterpillar Inc.:
Caterpillar is the world’s leading manufacturer of construction and mining equipment. Leydig has historically handled a significant portion of Caterpillar’s U.S. patent drafting requirements and continues to file applications on their behalf.

Elkay Manufacturing Company:
Leydig represents Elkay Manufacturing Company in patent matters, including prosecution and litigation. Elkay is a leading supplier of stainless steel sinks and potable water delivery systems, including drinking fountains and bottle filling stations.

The firm provides trademark search and clearance services for Google.

Huawei Technologies Co., Ltd.:
Leydig represents Huawei Technologies Co., Ltd. in both its patent litigation matters and its prosecution of US patent applications. Huawei is the largest telecommunications company in the world and consistently among the most prolific filers of patent applications in the world.

National Institutes of Health:
Leydig represents the National Institutes of Health (NIH) with respect to its worldwide patent requirements, particularly in securing patent protection for its ground-breaking technological innovations and developments in the fields of biotechnology and chemistry (pharmaceuticals).

Leydig has represented Perrigo in patent litigations involving generic versions of branded drugs. Leydig also represents Perrigo in opinion-related matters involving pharmaceutical products.

USG Corporation:
USG Corporation is a leading producer of building products. Leydig is one of USG’s go-to IP firms and has handled major litigations, including trade secret and patent infringement matters. It is also preparing and prosecuting patent applications in a variety of different subject matter areas.

Walgreen Co.:
In addition to working with Walgreens on contentious matters and trademark prosecution in the US, Leydig also represents Walgreens in foreign oppositions, and manages the company’s Chinese trademark portfolio.