How many patents does Nippon Piston Ring Co Ltd have in patentsdb?

Nippon Piston Ring Co Ltd is linked to 88 publications as assignee in our database.

What technology areas does Nippon Piston Ring Co Ltd patent most?

Top mapped technology areas by patent count: Mechanical Engineering (61); Chemistry & Metallurgy (55); Operations & Transport (32).

In our data, assignee counts were 8 in 2024 and 3 in 2025 (lower year over year).

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

Nippon Piston Ring Co Ltd holds 88 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 declining.

Latest publications where this party is an assignee.

Representative or frequently cited publications from precomputed assignee stats.

Mapped technology topics for this assignee.

Company technology slices
Technology	Patents
Mechanical Engineering	61
Chemistry & Metallurgy	55
Operations & Transport	32
Human Necessities	11
Cross-Sectional Technologies	10
Electricity	5
Fixed Constructions	1

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

How many patents does Nippon Piston Ring Co Ltd have in patentsdb?: Nippon Piston Ring Co Ltd is linked to 88 publications as assignee in our database.
What technology areas does Nippon Piston Ring Co Ltd patent most?: Top mapped technology areas by patent count: Mechanical Engineering (61); Chemistry & Metallurgy (55); Operations & Transport (32).
Is Nippon Piston Ring Co Ltd's patent activity growing?: In our data, assignee counts were 8 in 2024 and 3 in 2025 (lower year over year).
What are recent patents assigned to Nippon Piston Ring Co Ltd?: See the “Recent patents” section above for the latest 5 publications we attribute to this assignee.