Rare earth doped fiber and fiber optic amplifier
US-12586973-B2 · Mar 24, 2026 · US
Nippon Telegraph & Telephone patents
Nippon Telegraph & Telephone holds 9,582 patents in our database, with recent filings and technology areas summarized below.
| Metric | Value |
|---|---|
| Total patents | 9,582 |
| Recent patents | 4,473 |
| First publication | Jan 1, 2015 |
| Latest publication | Mar 24, 2026 |
Filing trend
Year-over-year patent counts for this assignee.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 166 |
| 2016 | 133 |
| 2017 | 154 |
| 2018 | 251 |
| 2019 | 278 |
| 2020 | 368 |
| 2021 | 1,134 |
| 2022 | 1,908 |
| 2023 | 1,786 |
| 2024 | 2,183 |
| 2025 | 1,149 |
| 2026 | 72 |
Recent patents
Latest publications where this party is an assignee.
Test script correction apparatus, test script correction method and program
US-2026079820-A1 · Mar 19, 2026 · US
Optical path route design device and optical path route design method
US-12581223-B2 · Mar 17, 2026 · US
Product group customer group extracting device, product group customer group extracting method, and product group customer group extracting program
US-2026073434-A1 · Mar 12, 2026 · US
Obstacle proximity detection device, obstacle proximity detection method, and obstacle proximity detection program
US-2026072196-A1 · Mar 12, 2026 · US
Notable patents
Representative or frequently cited publications from precomputed assignee stats.
Rare earth doped fiber and fiber optic amplifier
US-12586973-B2 · Mar 24, 2026 · US
Test script correction apparatus, test script correction method and program
US-2026079820-A1 · Mar 19, 2026 · US
Optical path route design device and optical path route design method
US-12581223-B2 · Mar 17, 2026 · US
Product group customer group extracting device, product group customer group extracting method, and product group customer group extracting program
US-2026073434-A1 · Mar 12, 2026 · US
Obstacle proximity detection device, obstacle proximity detection method, and obstacle proximity detection program
US-2026072196-A1 · Mar 12, 2026 · US
Top CPC classifications
Most common classification codes in this portfolio.
Technology areas
Mapped technology topics for this assignee.
| Technology | Patents |
|---|---|
| Physics | 5,971 |
| Electricity | 5,676 |
| Cross-Sectional Technologies | 470 |
| Human Necessities | 431 |
| Operations & Transport | 252 |
| Chemistry & Metallurgy | 140 |
| Mechanical Engineering | 58 |
| Fixed Constructions | 55 |
| Textiles & Paper | 12 |
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Frequently asked questions
Answers are generated from the same data shown on this page.
- How many patents does Nippon Telegraph & Telephone have in patentsdb?
- Nippon Telegraph & Telephone is linked to 9,582 publications as assignee in our database.
- What technology areas does Nippon Telegraph & Telephone patent most?
- Top mapped technology areas by patent count: Physics (5,971); Electricity (5,676); Cross-Sectional Technologies (470).
- Is Nippon Telegraph & Telephone's patent activity growing?
- In our data, assignee counts were 2,183 in 2024 and 1,149 in 2025 (lower year over year).
- What are recent patents assigned to Nippon Telegraph & Telephone?
- See the “Recent patents” section above for the latest 5 publications we attribute to this assignee.