Optical fiber base material manufacturing method, optical fiber base material, and optical fiber
US-2019292089-A1 · Sep 26, 2019 · US
doped with alkali metals
doped with alkali metals · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C03B2201/50 |
| Official title | doped with alkali metals |
| Display label | doped with alkali metals |
| Total patents | 123 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 16 |
| 2016 | 15 |
| 2017 | 14 |
| 2018 | 12 |
| 2019 | 8 |
| 2020 | 10 |
| 2021 | 8 |
| 2022 | 4 |
| 2023 | 15 |
| 2024 | 6 |
| 2025 | 13 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Optical fiber with low loss and nanoscale structurally homogeneous core
US-10259742-B2 · Apr 16, 2019 · US
Optical fiber preform
US-2019016630-A1 · Jan 17, 2019 · US
Method for manufacturing optical fiber preform, method for manufacturing optical fiber, and method for doping silica glass
US-2018370841-A1 · Dec 27, 2018 · US
Optical fiber
US-2018362392-A1 · Dec 20, 2018 · US
Thermal history-based etching
US-10155688-B2 · Dec 18, 2018 · US
Optical fiber preform
US-10155687-B2 · Dec 18, 2018 · US
Method of manufacturing coupled-core multi-core fiber
US-2018282200-A1 · Oct 4, 2018 · US
Optical fiber with low loss and nanoscale structurally homogeneous core
US-2018251397-A1 · Sep 6, 2018 · US
Optical fiber
US-10031282-B2 · Jul 24, 2018 · US
Method of making an optical fiber containing an alkali metal in the core
US-9932265-B2 · Apr 3, 2018 · US
Methods of making an optical fiber, and optical fiber
US-9932260-B2 · Apr 3, 2018 · US
Optical fiber with low loss and nanoscale structurally homogeneous core
US-9919955-B2 · Mar 20, 2018 · US
Thermal history-based etching
US-2018044227-A1 · Feb 15, 2018 · US
Additive manufacturing processes for making transparent 3d parts from inorganic materials
US-2018036945-A1 · Feb 8, 2018 · US
Optical fiber
US-2017371096-A1 · Dec 28, 2017 · US
Quasi-single-mode optical fiber with a large effective area
US-9846275-B2 · Dec 19, 2017 · US
Thermal history-based etching
US-9828284-B2 · Nov 28, 2017 · US
Optical fiber
US-2017305781-A1 · Oct 26, 2017 · US
Methods of making an optical fiber, and optical fiber
US-2017297947-A1 · Oct 19, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C03B2201/50?
- CPC C03B2201/50 is the Cooperative Patent Classification code for “doped with alkali metals.”
- How many patents are filed under CPC C03B2201/50 (doped with alkali metals)?
- Our database includes 123 publications tagged with this CPC code.
- Is patent activity under CPC C03B2201/50 growing?
- Publication counts under this code: 6 in 2024 vs 13 in 2025 (latest complete years).