How many patents does Toyo Seikan Co Ltd have in patentsdb?

Toyo Seikan Co Ltd is linked to 148 publications as assignee in our database.

What technology areas does Toyo Seikan Co Ltd patent most?

Top mapped technology areas by patent count: Operations & Transport (140); Cross-Sectional Technologies (26); Physics (22).

In our data, assignee counts were 46 in 2024 and 37 in 2025 (lower year over year).

See the “Recent patents” section above for the latest 5 publications we attribute to this assignee.

Toyo Seikan Co Ltd holds 148 patents in our database, with recent filings and technology areas summarized below.

Year-over-year patent counts for this assignee.

Filing activity appears to be declining based on the most recent years.

Latest publications where this party is an assignee.

Representative or frequently cited publications from precomputed assignee stats.

Most common classification codes in this portfolio.

Mapped technology topics for this assignee.

Company technology slices
Technology	Patents
Operations & Transport	140
Cross-Sectional Technologies	26
Physics	22
Chemistry & Metallurgy	21
Electricity	16
Human Necessities	11
Mechanical Engineering	3
Fixed Constructions	1

Answers are generated from the same data shown on this page.

How many patents does Toyo Seikan Co Ltd have in patentsdb?: Toyo Seikan Co Ltd is linked to 148 publications as assignee in our database.
What technology areas does Toyo Seikan Co Ltd patent most?: Top mapped technology areas by patent count: Operations & Transport (140); Cross-Sectional Technologies (26); Physics (22).
Is Toyo Seikan Co Ltd's patent activity growing?: In our data, assignee counts were 46 in 2024 and 37 in 2025 (lower year over year).
What are recent patents assigned to Toyo Seikan Co Ltd?: See the “Recent patents” section above for the latest 5 publications we attribute to this assignee.