Company lists · Data refreshed September 2026

Top 25 International patent law firms based in Canada

Name: International patent law firms based in Canada
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 129 companies tracked

RevenueBase identified 129 international patent law firms headquartered in Canada as of September 2026 and tracks 1,630 professional contacts across them, including 871 with verified work emails and 114 with mobile numbers. Toronto is the largest hub.

This list covers international patent law firms headquartered in Canada, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 4, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 4, 2026 86% judged on-target in blind review

129Companies

1,630Contacts tracked

871Verified emails

114Mobile numbers

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The 25 largest international patent law firms based in Canada

Ranked by team size

Top 25 of 129 international patent law firms based in Canada, ranked by team size, largest first. Data refreshed Sep 4, 2026. Evidence rates how directly each company's own description names international patent law firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Smart & BiggarPartial evidence	Ottawa, ON, CanadaHQ checked Sep 4, 2026	501-1,000	517
	“Smart & Biggar is widely recognized as Canada’s leading firm for intellectual property, and with over 180 lawyers, patent agents and trademark agents.” Source: company website · checked Sep 4, 2026
2	ROBICPartial evidence	Montréal, QC, CanadaHQ checked Sep 4, 2026	201-500	189
	“Plus de 130 ans d'excellence ROBIC est un cabinet multidisciplinaire de renommée internationale regroupant des professionnels aux compétences variées incluant des avocats, des…” Source: company website · checked Sep 4, 2026
3	MBM Intellectual Property LAW LLPPartial evidence	Ottawa, ON, CanadaHQ checked Sep 4, 2026	51-200	129
	“MBM Intellectual Property Law is a dynamic and progressive law firm that practices exclusively in the area of intellectual property (IP) with offices throughout Canada.” Source: company website · checked Sep 4, 2026
4	Oyen Wiggs Green & Mutala LLPPartial evidence	Vancouver, BC, CanadaHQ checked Sep 4, 2026	11-50	50
	“Established in 1977, Oyen Wiggs is a Vancouver-based independent intellectual property boutique law firm.” Source: company website · checked Sep 4, 2026
5	Gilbert's LLPPartial evidence	Toronto, ON, CanadaHQ checked Sep 4, 2026	11-50	33
	“Gilbert's LLP is an agile, energetic law firm with an astonishing track record.” Source: company website · checked Sep 4, 2026
6	Riches, Mckenzie & Herbert LLPPartial evidence	Toronto, ON, CanadaHQ checked Sep 4, 2026	11-50	26
	“Founded in 1887 and headquartered in Toronto, Canada, the boutique law firm of Riches, McKenzie & Herbert LLP is one of Canada’s oldest firms, practising solely in the field of…” Source: company website · checked Sep 4, 2026
7	Dipchand LLPPartial evidence	Toronto, ON, CanadaHQ checked Sep 4, 2026	11-50	24
	“Dipchand LLP is a law firm of dedicated, passionate lawyers with exceptional business insight focused on intellectual property, corporate/commercial and franchise law, as well as…” Source: company website · checked Sep 4, 2026
8	Aird & Mcburney LPPartial evidence	Toronto, ON, CanadaHQ checked Sep 4, 2026	11-50	20
	“The combined intellectual property team of Aird & McBurney LP and Aird & Berlis LLP brings together patent and trademark agents and lawyers who secure Canadian and worldwide…” Source: company website · checked Sep 4, 2026
9	Brion Raffoul LLPIndirect evidence	Ottawa, ON, CanadaHQ checked Sep 4, 2026	11-50	17
	“BRION RAFFOUL LLP is a premier Canadian IP boutique firm.” Source: company website · checked Sep 4, 2026
10	Goudreau Gage Dubuc Maintenant NOW Lavery AvocatsIndirect evidence	Montréal, QC, CanadaHQ checked Sep 4, 2026	201-500	17
	“A Home For Your Ideas ® Goudreau Gage Dubuc (GGD) is one of Canada's most reputable intellectual property firms.” Source: company website · checked Sep 4, 2026
11	Cpst Intellectual PropertyIndirect evidence	Toronto, ON, CanadaHQ checked Sep 4, 2026	11-50	16
	“With almost 100 years of combined experience among its founders, CPST focuses on providing the highest standard of client service and advice, always informed by the business…” Source: company website · checked Sep 4, 2026
12	Kirby Eades Gale BakerIndirect evidence	Ottawa, ON, CanadaHQ checked Sep 4, 2026	11-50	14
	“Founded in 1959 by Peter Kirby our firm is home to a team of highly qualified professionals who focus entirely upon intellectual property.” Source: company website · checked Sep 4, 2026
13	Macrae & COIndirect evidence	Ottawa, CanadaHQ checked Sep 4, 2026	11-50	14
	“Founded in 1934 by Alex E.” Source: company website · checked Sep 4, 2026
14	Affilia LegalStrong evidence	Montreal, QC, CanadaHQ checked Sep 4, 2026	1-10	14
	“A renowned firm specializing in business law and international trade, Affilia Legal LLP, comprehensively addresses the legal service needs of internationally oriented businesses.” Source: company website · checked Sep 4, 2026
15	Aventum IP LAW LLPPartial evidence	Ottawa, ON, CanadaHQ checked Sep 4, 2026	11-50	14
	“Aventum IP Law LLP (formerly Shapiro Cohen LLP) is an intellectual property firm located in the high-tech hub of Ottawa, Ontario.” Source: company website · checked Sep 4, 2026
16	PNK Piasetzki Nenniger Kvas LLPPartial evidence	Toronto, ON, CanadaHQ checked Sep 4, 2026	11-50	13
	“PNK Law LLP has been practicing exclusively in the area of intellectual property law for 30 years.” Source: company website · checked Sep 4, 2026
17	Heer LAWIndirect evidence	Toronto, ON, CanadaHQ checked Sep 4, 2026	11-50	13
	“We help businesses reach their full potential through effective acquisition, management, use and enforcement of intellectual property rights.” Source: company website · checked Sep 4, 2026
18	Nexus LAW Group LLPPartial evidence	Vancouver, BC, CanadaHQ checked Sep 4, 2026	11-50	13
	“Nexus Law Group LLP is an intellectual property law firm located in Vancouver and Victoria, Canada.” Source: company website · checked Sep 4, 2026
19	Brunet & COIndirect evidence	London, ON, CanadaHQ checked Sep 4, 2026	1-10	11
	“Brunet & Co.(aka BrunetCo) is a Canadian intellectual property firm serving both foreign and Canadian domestic markets.” Source: company website · checked Sep 4, 2026
20	Aitken Klee LLPIndirect evidence	Ottawa, ON, CanadaHQ checked Sep 4, 2026	11-50	11
	“Aitken Klee specializes in complex intellectual property litigation.” Source: company website · checked Sep 4, 2026
21	Belmore Neidrauer LLPIndirect evidence	Toronto, ON, CanadaHQ checked Sep 4, 2026	11-50	10
	“Belmore Neidrauer excels in IP litigation.” Source: company website · checked Sep 4, 2026
22	Oziel LAWPartial evidence	Toronto, ON, CanadaHQ checked Sep 4, 2026	11-50	10
	“Oziel Law is an entrepreneurial law firm which provides corporate and business law, computer and technology law, intellectual property (IP) law and contract drafting legal…” Source: company website · checked Sep 4, 2026
23	Ollip P.CIndirect evidence	Ottawa, ON, CanadaHQ checked Sep 4, 2026	1-10	10
	“Protecting IP Assets in Canada & Around the World If you are a brand or technology owner, you don’t have to be told about the value of protecting and enforcing your assets.” Source: company website · checked Sep 4, 2026
24	Rowand LLPIndirect evidence	Toronto, ON, CanadaHQ checked Sep 4, 2026	11-50	9
	“Rowand LLP was established to provide practical and valuable intellectual property services for entrepreneurs and established companies working at the leading edge of technology.” Source: company website · checked Sep 4, 2026
25	Anglehart ET ALIndirect evidence	Montreal, QC, CanadaHQ checked Sep 4, 2026	1-10	9
	Source: company website · checked Sep 4, 2026

Showing 25 of 129 international patent law firms based in Canada

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International patent law firms based in Canada at a glance

As of Sep 4, 2026

1-10Median size (employees)

TorontoLargest hub · 41 HQs

114Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Verified emails by last verification

0–30

31–60

61–90

464

90–180

350

180+

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among international patent law firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Canada whose own description of what they do matches “international patent law firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among international patent law firms, and records with no verified work email. Companies headquartered outside Canada are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 871 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 4, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

International patent law firms by metro

International patent law firms in Toronto41

Frequently asked

How many international patent law firms are there based in Canada?

RevenueBase identified 129 international patent law firms headquartered in Canada as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Smart & Biggar, headquartered in Ottawa, tops this list with the largest team on record.

Which city has the most international patent law firms?

Toronto leads with 41 headquartered companies, followed by Ottawa (18) and Montreal (15).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 871 verified decision-maker contacts tracked across these 129 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 4, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.