Earlier in April, we published our fourth annual Patent Prosecution Intelligence Report. The report was our first attempt to rank patent attorneys by activity and performance after extracting their names from the file wrapper. We also looked at changes in the activity of different firms and companies and tried to understand the factors behind them (e.g., lateral moves, drop in the workload, etc.).

We already have covered some insights from this report such as the analysis of Apple’s top patent attorneys (Patexia 133), the most inventive cities and states in the U.S. (Patexia 134), China becoming the second most active patentee (Patexia 136) and the analysis of the drop in Japanese patents (Patexia 141). Furthermore, when it comes to entities and their rankings, we have revealed some of the very best companies in Patexia 140, the most active and best-performing firms in Patexia 142 as well as the top patent prosecution attorneys in Patexia 145. This week, we will turn our attention to the law firms with the largest growth or decline in patent work, using the data from this report.

Our Patent Prosecution Intelligence 2022 covers the past five years, from January 1, 2017, through December 31, 2021. During this period there have been significant shifts in patenting trends. The pandemic certainly played a role, not only in the overall filing trends but also in individual entities, which either expanded their practice or shrunk their activities. During this period, USPTO issued 1,823,414 patents and published 2,038,338 applications. The chart below outlines the activity distributed yearly and the patenting trends by analyzing these two key parameters:

As seen above, the number of published applications has been fluctuating between a maximum of 433,868 in 2019 and a minimum of 382,362 in 2021. When it comes to issued patents, the year 2019 has the highest number of patents issued at 395,456 while 2018 has the least with 337,697. The last two years of the chart and the number of issued patents will be our focus and the source of data to discover the law firms with the largest growth and decline in patents.

In our Patent Prosecution Intelligence 2022, we evaluated a total of 3,591 law firms that secured these patents for 117,772 foreign and domestic entities during the period of our study. To understand which law firms are the ones with the largest growth or decline, we limited our analysis to the top 1,000 most active law firms in 2020 and performed a comparative analysis with the data for 2021. Since there are law firms with a relatively small number of patents where even a small change in numbers causes a significant change in terms of percentage, we performed the comparison using the absolute numbers. The following bar chart illustrates the top five law firms with the largest decline in the number of issued patents in 2021:

As seen above, the law firms with the largest decline are also some of the most active firms mentioned in the Patent Prosecution Intelligence Report.

Noticeable is the presence of Oblon, McClelland, Maier & Neustadt leading the ranking. Their volume of issued patents decreased in 2020 as well when compared to 2019 (Patexia 107). In 2021, they saw a further decrease of 831 patents while nonetheless, they remain the most active law firm. Toshiba, Sony Group Corporation, and Mitsubishi Electric Corporation are still their main clients.
Kilpatrick Townsend & Stockton follows with 770 fewer issued patents in 2021 when compared to 2020. They work closely with Amazon, Visa, and Apple and are ranked as the 10th most active patent prosecution firm in our report.
With 516 fewer patents in 2021, Morgan Lewis & Bockius ranks third here for the largest decline but also ranked in the report as one of the most active law firms during the period of our study. Their main clients are in the car industry: Hyundai and Kia Motors America.
Cantor Colburn is another active patent firm that had 508 fewer patents in 2021. Their top clients are International Business Machines and Samsung Electronics.
Oliff with 411 fewer patents in 2021 is the 5th law firm with the largest decline. They have worked closely with Denso Corporation, Epson Corporation, and Xerox, which were their main clients in this period.

Even though 2021’s numbers represent a decline in patents issued and published, this still does not seem to have affected several law firms, which have managed to grow their numbers in 2021. Illustrated in the chart below are the top five law firms with the most significant growth:

Interestingly, in absolute numbers, the growth of these firms is smaller when compared to the decline of the other five firms. This may be another proxy for patenting activity, showing that the activity has been slowing down in recent years.

Perkins Coie with 281 more patents in 2021 leads this chart. They are one of the active law firms, ranked as the 25th most active firm in this period. The firm has worked closely with Micron Technology and Fraunhofer-Gesellschaft.
Bayramoglu Law Offices is the second-largest-growing law firm with 208 more patents in 2021. This relatively small firm works with the University of Management and Technology and the Institute of Microelectronics Chinese Academy of Sciences.
Nixon Vanderhye is the 3rd in our chart with 193 more patents in 2021. The firm has many foreign clients including Asian companies. Denso Corporation and Samsung Electronics were their main clients based on their patenting activity.
Dinsmore & Shohl holds 4th place on this chart with 188 more patents secured in 2021. The firm worked with Denso Corporation and Saudi Arabian Oil Company as their top two clients in patent prosecution during the period of our study.
Lewis Roca Rothgerber Christie LLP comes last in this chart with 161 more patents in 2021. This is another active firm that has seen growth recently. Samsung Electronics and Raytheon Technologies Corporation have been their top clients in our study’s period.

The following table summarizes the top 10 firms covered above (largest growth and decline):

Law Firm	Patents (2021)	Patents (2020)	Change	Difference
Perkins Coie	1841	1560	18.01%	281
Bayramoglu Law Offices	621	413	50.36%	208
Nixon Vanderhye	2170	1977	9.76%	193
Dinsmore & Shohl	1332	1144	16.43%	188
Lewis Roca Rothgerber Christie LLP	1302	1141	14.11%	161
Oliff	3,493	3904	-10.53%	-411
Cantor Colburn	3,949	4457	-11.40%	-508
Morgan Lewis & Bockius	2,801	3317	-15.56%	-516
Kilpatrick Townsend & Stockton	3,047	3817	-20.17%	-770
Oblon, McClelland, Maier & Neustadt, L.L.P.	4,767	5598	-14.84%	-831

The full Patent Prosecution Intelligence 2022 provides other insights related to patenting trends as well as the evaluation and rankings of the top 1000 most active companies, law firms, and attorneys/agents. We analyzed and reviewed various metrics including filing activity, the pendency of applications, number of extensions requested, number of office actions, allowance rate, changes in the claim language, and length of the claims. Using these parameters, we generated the rankings in high-tech, bio-tech, and overall categories.

Stay tuned as in the following weeks we will begin the coverage of our upcoming ANDA Litigation Intelligence Report analyzing different topics and revealing the highlights from this report.