Zeisler

Zeisler PLLC is a New York City-headquartered law firm that focuses on commercial and intellectual property disputes, operating in a "nimbler environment" with a team of experienced lawyers who previously practiced at larger firms. While the firm does not appear in the AmLaw 100 or 200 rankings, it has achieved a Tier 3 National Ranking and a Tier 3 New York City ranking for Litigation - Intellectual Property by Best Law Firms.

The firm's IP litigation practice is comprehensive, encompassing patent infringement enforcement and defense, as well as pharmaceutical, ANDA, and biosimilars patent litigation. Key partners possess experience across diverse technology areas, including pharmaceuticals, biotechnology, medical devices, semiconductors, telecommunications, software, and consumer electronics. Additionally, the firm handles trade secret disputes, copyright litigation, and open-source licensing matters.

Zeisler PLLC represents both intellectual property rights holders and accused infringers. The provided case data indicates one plaintiff-side appearance, but the firm's stated practice areas and partner experience demonstrate a balanced approach to patent litigation, including defense of trade secret misappropriation claims and enforcement of patent rights.

While the firm's specific notable case outcomes as "Zeisler PLLC" are not extensively detailed in public records for named cases, its partners bring significant achievements. Daniel B. Ravicher, a Member of the firm, is a nationally recognized expert in patent law who, prior to joining Zeisler PLLC in 2016, successfully argued the landmark 2013 Supreme Court case that ruled human genes cannot be patented. Managing Member Aaron M. Zeisler has secured dismissals of trade secret misappropriation claims with awards of attorneys' fees and obtained multi-million dollar judgments for clients in patent and fuel cell technology disputes.

Zeisler PLLC actively engages in post-grant proceedings before the Patent Trial and Appeal Board (PTAB), explicitly listing "Patent Inter Partes Review Petition and Defense" among its practice areas. Daniel B. Ravicher serves as lead counsel for petitioners in inter partes review (IPR) proceedings, demonstrating the firm's involvement in this aspect of patent litigation. Key partners leading the firm's intellectual property litigation practice include Managing Member Aaron M. Zeisler and Member Daniel B. Ravicher.