Amine separation method
US-2026062375-A1 · Mar 5, 2026 · US
Separation of optical isomers
Separation of optical isomers · 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 | C07C209/88 |
| Official title | Separation of optical isomers |
| Display label | Separation of optical isomers |
| Total patents | 33 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 1 |
| 2017 | 4 |
| 2018 | 4 |
| 2019 | 7 |
| 2020 | 3 |
| 2021 | 2 |
| 2022 | 1 |
| 2023 | 4 |
| 2025 | 3 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Process for the production of (1r,2s)-2,6-dimethyl-1-indanamine using dynamic kinetic stereoisomer resolution
US-2026055048-A1 · Feb 26, 2026 · US
Device and method for converting and separating at least one reactant and a reaction product thereof
US-12485400-B2 · Dec 2, 2025 · US
Method for manufacture of isophoronediamine
US-2025304525-A1 · Oct 2, 2025 · US
Process to produce (1r,4r)-4-substituted cyclohexane-1-amines
US-2025122542-A1 · Apr 17, 2025 · US
Methods of synthesis of (1R,2R,5R)-5-amino-2-methyl-cyclohexanol hydrochloride and intermediates useful therein
US-11780801-B2 · Oct 10, 2023 · US
Method for producing optically active compound
US-2023257408-A1 · Aug 17, 2023 · US
Method for preparing toluylene diamine mixtures
US-2023159433-A1 · May 25, 2023 · US
A device and method for converting and separating at least one reactant and a reaction product thereof
US-2023149880-A1 · May 18, 2023 · US
Methods of synthesis of (1r,2r,5r)-5-amino-2-methyl-cyclohexanol hydrochloride and intermediates useful therein
US-2022234990-A1 · Jul 28, 2022 · US
Methods of synthesis of (1R,2R,5R)-5-amino-2-methylcyclohexanol hydrochloride and intermediates useful therein
US-11192847-B2 · Dec 7, 2021 · US
Process for preparing an aromatic polyamine mixture
US-11028042-B2 · Jun 8, 2021 · US
Methods of synthesis of (1r,2r,5r)-5-amino-2-methylcyclohexanol hydrochloride and intermediates useful therein
US-2020369600-A1 · Nov 26, 2020 · US
Process for preparing an aromatic polyamine mixture
US-2020339501-A1 · Oct 29, 2020 · US
Methods of synthesis of (1R, 2R, 5R)-5-amino-2-methylcyclohexanol hydrochloride and intermediates useful therein
US-10774033-B2 · Sep 15, 2020 · US
Isomerization method for cyclohexanediamine
US-10407380-B2 · Sep 10, 2019 · US
Method for producing cis- and trans-enriched MDACH
US-10336668-B2 · Jul 2, 2019 · US
Isomerization of MDACH
US-10329238-B2 · Jun 25, 2019 · US
Methods of synthesis of (1r,2r,5r)-5-amino-2-methylcyclohexanol hydrochloride and intermediates useful therein
US-2019152893-A1 · May 23, 2019 · US
Compound, and flavor composition and/or fragrance composition containing same
US-10294193-B2 · May 21, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C07C209/88?
- CPC C07C209/88 is the Cooperative Patent Classification code for “Separation of optical isomers.”
- How many patents are filed under CPC C07C209/88 (Separation of optical isomers)?
- Our database includes 33 publications tagged with this CPC code.
- Is patent activity under CPC C07C209/88 growing?
- Publication counts under this code: 4 in 2023 vs 3 in 2025 (latest complete years).