How many patents does Hitachi Energy Ltd have in patentsdb?

Hitachi Energy Ltd is linked to 481 publications as assignee in our database.

What technology areas does Hitachi Energy Ltd patent most?

Top mapped technology areas by patent count: Electricity (432); Physics (121); Cross-Sectional Technologies (60).

In our data, assignee counts were 192 in 2024 and 219 in 2025 (higher year over year).

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

Hitachi Energy Ltd holds 481 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 growing 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
Electricity	432
Physics	121
Cross-Sectional Technologies	60
Operations & Transport	18
Mechanical Engineering	15
Chemistry & Metallurgy	10

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

How many patents does Hitachi Energy Ltd have in patentsdb?: Hitachi Energy Ltd is linked to 481 publications as assignee in our database.
What technology areas does Hitachi Energy Ltd patent most?: Top mapped technology areas by patent count: Electricity (432); Physics (121); Cross-Sectional Technologies (60).
Is Hitachi Energy Ltd's patent activity growing?: In our data, assignee counts were 192 in 2024 and 219 in 2025 (higher year over year).
What are recent patents assigned to Hitachi Energy Ltd?: See the “Recent patents” section above for the latest 5 publications we attribute to this assignee.