Francis J Duffin

Trademark attorney of record on 1,671 registered marks in USPTO records.

Top Trademark Attorney
1,671registrations of record
21list appearances
#1best rank achieved
32states represented

Recognition

Top Trademark Attorney #2 — Connecticut All years · 373 registrations
Top Trademark Attorney #4 — Connecticut 2024 · 16 registrations
Top Trademark Attorney #3 — Connecticut 2023 · 16 registrations
Top Trademark Attorney #7 — Connecticut 2022 · 10 registrations
Top Trademark Attorney #5 — Connecticut 2021 · 12 registrations
Top Trademark Attorney #3 — Connecticut 2018 · 16 registrations
Top Trademark Attorney #4 — Connecticut 2017 · 17 registrations
Top Trademark Attorney #10 — Connecticut 2016 · 11 registrations
Top Trademark Attorney #8 — Connecticut 2015 · 14 registrations
Top Trademark Attorney #7 — Connecticut 2014 · 14 registrations
Top Trademark Attorney #10 — Connecticut 2012 · 11 registrations
Top Trademark Attorney #5 — Connecticut 2011 · 14 registrations
Top Trademark Attorney #5 — Connecticut 2010 · 12 registrations
Top Trademark Attorney #4 — Connecticut 2008 · 21 registrations
Top Trademark Attorney #8 — Connecticut 2007 · 10 registrations
Top Trademark Attorney #1 — Connecticut 2005 · 23 registrations
Top Trademark Attorney #1 — Connecticut 2004 · 22 registrations
Top Trademark Attorney #1 — Connecticut 2003 · 38 registrations
Top Trademark Attorney #4 — Connecticut 2002 · 21 registrations
Top Trademark Attorney #5 — Connecticut 2001 · 12 registrations
Top Trademark Attorney #6 — Connecticut 2000 · 14 registrations

Registrations by year

202628
202555
202491
202376
202271
202157
202058
201957
201870
201773
201661
201575
201472
201350
201256
201165
201068
200973
200882
200760

Where their clients are incorporated

Delaware430 registrations
Connecticut373 registrations
New York133 registrations
New Jersey40 registrations
Pennsylvania39 registrations
Virginia30 registrations
California18 registrations
Washington15 registrations

Based on the owner address of record. Companies frequently incorporate in one state while operating in another, so this reflects client domicile rather than where the attorney practises.

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How this list is compiled

TrademarkToolbox Top Trademark Attorney lists are not a ranking of attorney quality. Rank is based solely on the number of trademark registrations that list the attorney as attorney of record, for applications tied to the jurisdictions listed above. It measures filing volume, nothing else.

Volume reflects firm size, practice model and client mix. A solo practitioner handling a small number of complex matters will rank below a high-volume filing practice, and that says nothing about the quality of either. These lists are not an endorsement, a recommendation, or a substitute for your own due diligence when choosing counsel.

Data comes from USPTO public records as indexed by TrademarkToolbox. Attorney names are matched conservatively: we do not merge similar names, so an attorney who appears in the record under more than one form may be undercounted. Counts include registered marks only, by registration year. Full methodology · Request a correction or removal