Phosphorus-containing passivator, perovskite solar cell, photovoltaic module, photovoltaic system, and electric apparatus
US-2026033235-A1 · Jan 29, 2026 · US
Quaternary phosphonium compounds
Quaternary phosphonium compounds · 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 | C07F9/54 |
| Official title | Quaternary phosphonium compounds |
| Display label | Quaternary phosphonium compounds |
| Total patents | 44 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 2 |
| 2017 | 2 |
| 2018 | 2 |
| 2019 | 8 |
| 2020 | 3 |
| 2021 | 11 |
| 2022 | 2 |
| 2023 | 4 |
| 2024 | 4 |
| 2025 | 1 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Ylide-functionalised phosphanes for use in metal complexes and homogeneous catalysis
US-12521704-B2 · Jan 13, 2026 · US
Phosphonium compound, reagent kit for derivatization, mass spectrometric method, and method for producing phosphonium compound
US-12291546-B2 · May 6, 2025 · US
Organopolysiloxane compound, method for producing same, and antistatic agent and curable composition, each of which contains same
US-12054588-B2 · Aug 6, 2024 · US
Method for producing triarylorganoborates
US-12043636-B2 · Jul 23, 2024 · US
Ylide-functionalised phosphanes for use in metal complexes and homogeneous catalysis
US-2024149256-A1 · May 9, 2024 · US
Method for producing triarylorganoborates
US-2024002409-A1 · Jan 4, 2024 · US
Method for producing triarylorganoborates
US-11760765-B2 · Sep 19, 2023 · US
Electrolytes for target ion transport
US-2023216086-A1 · Jul 6, 2023 · US
Phosphonium Compound, Reagent Kit for Derivatization, Mass Spectrometric Method, and Method for Producing Phosphonium Compound
US-2023112623-A1 · Apr 13, 2023 · US
Mito-magnolol compounds and methods of synthesis and use thereof
US-11612610-B2 · Mar 28, 2023 · US
Mito-Magnolol Compounds and Methods of Synthesis and Use Thereof
US-2022211727-A1 · Jul 7, 2022 · US
Method for producing triarylorganoborates
US-2022002321-A1 · Jan 6, 2022 · US
Organopolysiloxane compound, method for producing same, and antistatic agent and curable composition, each of which contains same
US-2021355284-A1 · Nov 18, 2021 · US
Ionic tags for synthesis of oligoribonucleotides
US-2021300954-A1 · Sep 30, 2021 · US
Trialkylphosphonium ionic liquids, methods of making, and alkylation processes using trialkylphosphonium ionic liquids
US-11123721-B2 · Sep 21, 2021 · US
Method for producing triarylorganoborates
US-11098066-B2 · Aug 24, 2021 · US
Mito-magnolol compounds and methods of synthesis and use thereof
US-11083739-B2 · Aug 10, 2021 · US
Ylide-functionalised phosphanes for use in metal complexes and homogeneous catalysis
US-2021205800-A1 · Jul 8, 2021 · US
Ionic tags for synthesis of oligoribonucleotides
US-11014948-B2 · May 25, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C07F9/54?
- CPC C07F9/54 is the Cooperative Patent Classification code for “Quaternary phosphonium compounds.”
- How many patents are filed under CPC C07F9/54 (Quaternary phosphonium compounds)?
- Our database includes 44 publications tagged with this CPC code.
- Is patent activity under CPC C07F9/54 growing?
- Publication counts under this code: 4 in 2024 vs 1 in 2025 (latest complete years).