Quaternary alkyl ammonium hypochlorite solution, method of producing the same, and method for processing semiconductor wafers
US-11572331-B2 · Feb 7, 2023 · US
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with formation of quaternary ammonium compounds
with formation of quaternary ammonium 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 | C07C209/20 |
| Official title | with formation of quaternary ammonium compounds |
| Display label | with formation of quaternary ammonium compounds |
| Total patents | 13 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2016 | 2 |
| 2017 | 1 |
| 2018 | 2 |
| 2019 | 3 |
| 2020 | 1 |
| 2021 | 1 |
| 2022 | 2 |
| 2023 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Quaternary alkyl ammonium hypochlorite solution, method of producing the same, and method for processing semiconductor wafers
US-2022315522-A1 · Oct 6, 2022 · US
Quaternary alkyl ammonium hypochlorite solution, method of producing the same, and method for processing semiconductor wafers
US-11390577-B2 · Jul 19, 2022 · US
Quaternary alkyl ammonium hypochlorite solution, method of producing the same, and method for processing semiconductor wafers
US-2021155878-A1 · May 27, 2021 · US
Use of specific derivatives of quaternized nitrogen compounds as additives in fuels and lubricants
US-10815444-B2 · Oct 27, 2020 · US
Use of specific derivatives of quaternized nitrogen compounds as additives in fuels and lubricants
US-2019316053-A1 · Oct 17, 2019 · US
Ionic liquids and preparation method thereof
US-10411301-B2 · Sep 10, 2019 · US
Use of specific derivatives of quaternized nitrogen compounds as additives in fuels and lubricants
US-10370610-B2 · Aug 6, 2019 · US
Method for preparing structured directing agent
US-2018244618-A1 · Aug 30, 2018 · US
Method for preparing structured directing agent
US-2018016231-A9 · Jan 18, 2018 · US
Ionic liquids and preparation method thereof
US-2017222266-A1 · Aug 3, 2017 · US
Method for preparing structured directing agent
US-2016304457-A1 · Oct 20, 2016 · US
Use of specific derivatives of quaternized nitrogen compounds as additives in fuels and lubricants
US-2016272911-A1 · Sep 22, 2016 · US