In representing our clients, we offer a team oriented approach. The unique talents and experience of each team member allow us to provide responsive and quality services.


Our team is available to assist in the preparation, filing and prosecution of patent applications in both the United States and foreign jurisdictions. Generally, after an initial consultation, we can advise you on a recommended course of action with respect to protecting and creating an asset out of your innovation. Please contact us for further information.


Your mark is a valuable and tangible business asset that should be protected. Our team is experienced in the trademark filing process, as well as representation before the trademark office and in trademark disputes. Please contact us for further information regarding trademarks.


Protecting your creativity and original works is an important consideration when thinking about your intellectual property rights. Please contact us for further information.

Best Of Fairfield County 2016

Ziegler IP Law Group LLC has been named one of Fairfield Counties best in 2016. Click here to learn more.

About Us

Profile Picture Grover F Fuller, Jr.

Grover F. Fuller, Jr.

Patent Attorney (Admitted in NY & MA), Registered to practice before the United States Patent and Trademark Office.

J.D. – New England School of Law
B.A., Biochemistry – University of Pennsylvania

Grover’s practice focuses on chemical, biochemical and pharmaceutical technologies. He is engaged in all aspects of patent law including drafting and prosecuting patent cases, opinions (patentability, validity, infringement & freedom to operate), international IP law and filing strategies, due diligence and licensing. As a senior patent attorney at Pfizer and counsel to multiple Fortune 500 companies, start-ups and individual inventors, Grover has unique legal, scientific and commercial business skills on U.S. and foreign patent matters.

Profile Picture Joseph V Gamberdell, Jr.

Joseph V. Gamberdell, Jr.

Patent Attorney, Registered to practice before the United States Patent and Trademark Office.

J.D. – Quinnipiac University
B.S., Electrical Engineering – University of Bridgeport

Electronics; transducers; electro-mechanical devices; software and applications; computers; medical scanning and diagnostic equipment; analog and digital test equipment; networks; chromatography, spectroscopy, thermal analysis and electrophoresis instruments; terrestrial and satellite telecommunications; motors.

Profile Picture Robert L Rispoli, Jr.

Robert L. Rispoli

Corporate, Intellectual Property and Litigation Counsel. Admitted: USPTO; U.S. District Courts of CT, MA & NH, U.S. Court of Appeals Federal Circuit; CT Bar;

J.D., Honors Graduate – University of Connecticut School of Law
M.B.A, Honors Graduate – Concentration in Finance; Rensselaer Polytechnic Institute
B.S., Mechanical and Materials Engineering – University of Connecticut

Robert has been engaged both in corporate law and in private practice. He focuses his practice on protecting intellectual property for corporations with an emphasis on the mechanical arts including machine design, hydraulic and load-bearing devices, heavy vehicle apparatus, industrial cutters and tooling, oil and natural gas extraction, power generation, building materials and consumer products. His practice has included serving as trial counsel in patent and trademark litigation matters including assertion of intellectual property rights and defense of infringement allegations. Robert has experience preparing and prosecuting patent and trademark applications, negotiating and drafting transactional and joint venture agreements, and providing for compliance with government contracts with a broad array of federal agencies. He also has experience in handling compliance with government import/export regulations including International Traffic in Arms Regulations (ITAR), and has managed responses to related government investigations.

Prior to receiving his law degree, Robert worked for Pratt & Whitney in a number of engineering roles including as an ISO 9000 management representative for the Overhaul & Repair Organization. Robert has practiced law with the litigation group of Day, Berry & Howard (Day Pitney LLP), and with the intellectual property group of Cummings & Lockwood (McCarter & English, LLP). He also has served as General Counsel, IP Counsel, and Corporate Secretary for a combustion engineering research and development corporation.

Public Service
Veteran: US Army/Connecticut Army National Guard
Board of Ethics; Town of Windsor (Former Member)
Windsor Town Council; Town of Windsor (Former Member)
Inland Wetlands & Watercourses Commission; Town of Windsor (Former Chairman/Member)
UConn School of Engineering Alumni Association (Member and Former President)

Profile Picture Kevin Strobel

Kevin Strobel

Patent Agent, Registered to practice before the United States Patent and Trademark Office

M.E., Computer and System Engineering – Rensselaer Polytechnic Institute
B.S., Electrical Engineering and Computer Engineering – University of Connecticut

Kevin's experience include thirty years as a design engineer in a wide variety of computer software, data processing, electrical and electromechanical arts, including cryptography, internet security, motion control and semiconductor design. Most recently, Kevin has been drafting and prosecuting patent application in the electrical, computer and electromechanical arts.

Doug D. Zhang

Patent Attorney, U.S. District Courts for the Southern and Eastern Districts of New York U.S. Patent and Trademark Office

J.D., Magna Cum Laude, Law Review – New York Law School
Master of Intellectual Property – University of New Hampshire Franklin Pierce School of Law
B.S., Mechanical Engineering – Shanghai Jiao Tong University

Doug is a seasoned US intellectual property attorney with a mechanical engineering background and over 33 years of diverse IP experience ranging from boutique IP law firms, general practice law firms, and a Fortune 50 company. His deep domain expertise has been in U.S. and foreign patent, trademark, copyright, and other related intellectual property matters and disputes.
While working for the Fortune 50 company, Doug managed patent portfolios for its various businesses, including driving strategic and tactical aspects of IP operation, such as helping patent evaluation boards choose the proper protection for IP assets, educating engineers on IP, supporting business M&A activities, studying competitors’ patents to assess risks, preparing and prosecuting patent applications in diverse technical fields in the US and throughout the world to support the growth strategies of these businesses, and defending patents in oppositions and cancellations.
Doug is fluent in Chinese.

Profile Picture Geza C Ziegler, Jr.

Geza C. Ziegler, Jr.

Patent Attorney, Registered to practice before the United States Patent and Trademark Office.

J.D. – Quinnipiac University
M.B.A – Sacred Heart University
B.S.E.E., Electrical Engineering – University of Bridgeport

Geza concentrates his practice in patent and trademark matters. He has extensive experience drafting and prosecuting patent applications, mainly in the electrical, computer, business method and mechanical arts. He is also involved with developing patent opinions and post grant proceedings, and in particular, ex parte and inter partes reexamination proceedings. With respect to trademarks, Geza is involved the trademark filing and registration process, as well as opposition and cancellation proceedings.