How many patents does Liu Jian have in patentsdb?

Liu Jian is linked to 56 publications as assignee in our database.

What technology areas does Liu Jian patent most?

Top mapped technology areas by patent count: Chemistry & Metallurgy (28); Human Necessities (26); Operations & Transport (22).

In our data, assignee counts were 3 in 2024 and 1 in 2025 (lower year over year).

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

Liu Jian holds 56 patents in our database, with recent filings and technology areas summarized below.

Year-over-year patent counts for this assignee.

Filing activity over the last five years is rapidly declining.

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
Chemistry & Metallurgy	28
Human Necessities	26
Operations & Transport	22
Cross-Sectional Technologies	13
Mechanical Engineering	9
Physics	7
Electricity	6

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

How many patents does Liu Jian have in patentsdb?: Liu Jian is linked to 56 publications as assignee in our database.
What technology areas does Liu Jian patent most?: Top mapped technology areas by patent count: Chemistry & Metallurgy (28); Human Necessities (26); Operations & Transport (22).
Is Liu Jian's patent activity growing?: In our data, assignee counts were 3 in 2024 and 1 in 2025 (lower year over year).
What are recent patents assigned to Liu Jian?: See the “Recent patents” section above for the latest 5 publications we attribute to this assignee.