Optical Fiber, Optical Fiber Preparation Method, and Optical Fiber Amplifier
US-2025316945-A1 · Oct 9, 2025 · US
containing phosphorus
containing phosphorus · 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 | C03C2201/28 |
| Official title | containing phosphorus |
| Display label | containing phosphorus |
| Total patents | 44 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 6 |
| 2016 | 4 |
| 2017 | 8 |
| 2018 | 4 |
| 2019 | 6 |
| 2020 | 2 |
| 2021 | 2 |
| 2022 | 7 |
| 2023 | 4 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Photodarkening-resistant ytterbium-doped quartz optical fiber and preparation method therefor
US-11780768-B2 · Oct 10, 2023 · US
Glass powder composite, and method of producing glass powder composite
US-2023202909-A1 · Jun 29, 2023 · US
Manufacturing method for optical fiber and manufacturing apparatus for optical fiber
US-11667560-B2 · Jun 6, 2023 · US
Glasses having high fracture toughness
US-2023056119-A1 · Feb 23, 2023 · US
Glasses having high fracture toughness
US-11485674-B2 · Nov 1, 2022 · US
Glasses and glass-ceramics and methods of making them
US-2022289617-A1 · Sep 15, 2022 · US
Process of fabrication of Erbium and Ytterbium-co-doped multi-elements silica glass based cladding-pumped fiber
US-11407671-B2 · Aug 9, 2022 · US
Glass-based articles with improved stress profiles
US-2022220026-A1 · Jul 14, 2022 · US
Glasses and glass-ceramics and methods of making them
US-11319239-B2 · May 3, 2022 · US
Glass-based articles with improved stress profiles
US-11312657-B2 · Apr 26, 2022 · US
Glasses and glass-ceramics and methods of making them
US-2022106224-A1 · Apr 7, 2022 · US
Manufacturing method for optical fiber and manufacturing apparatus for optical fiber
US-2021292223-A1 · Sep 23, 2021 · US
Photodarkening-resistant ytterbium-doped quartz optical fiber and preparation method therefor
US-2021230051-A1 · Jul 29, 2021 · US
Optical fiber
US-10670812-B2 · Jun 2, 2020 · US
Glass-based articles with improved stress profiles
US-2020002225-A1 · Jan 2, 2020 · US
Process of fabrication of erbium and ytterbium-co-doped multi-elements silica glass based cladding-pumped fiber
US-2019375672-A1 · Dec 12, 2019 · US
Glasses having high fracture toughness
US-2019300422-A1 · Oct 3, 2019 · US
Glass composite for use in extreme ultra violet lithography
US-10427974-B2 · Oct 1, 2019 · US
High temperature oxidation protection for composites
US-2019233324-A1 · Aug 1, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C03C2201/28?
- CPC C03C2201/28 is the Cooperative Patent Classification code for “containing phosphorus.”
- How many patents are filed under CPC C03C2201/28 (containing phosphorus)?
- Our database includes 44 publications tagged with this CPC code.
- Is patent activity under CPC C03C2201/28 growing?
- Publication counts under this code: 4 in 2023 vs 1 in 2025 (latest complete years).