Chiral spirocyclic compounds and methods of preparation and use thereof
US-2025229262-A1 · Jul 17, 2025 · US
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Spiro-condensed ring systems
Spiro-condensed ring systems · Cooperative Patent Classification (CPC)
Separating, mixing, shaping, printing, and transporting materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | B01J31/249 |
| Official title | {Spiro-condensed ring systems} |
| Display label | Spiro-condensed ring systems |
| Total patents | 19 |
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 | 4 |
| 2016 | 3 |
| 2017 | 2 |
| 2018 | 1 |
| 2019 | 3 |
| 2020 | 1 |
| 2021 | 3 |
| 2022 | 1 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Compound of 3,3,3′,3′-tetramethyl-1,1′-spirobiindane-based phosphine ligand, and preparation method thereof
US-11530230-B2 · Dec 20, 2022 · US
3,3,3′,3′-tetramethyl-1,1′-spirobiindane-based phosphinooxazoline ligand compound, preparation method and uses of the same
US-11111258-B2 · Sep 7, 2021 · US
Compound of 3,3,3',3'-tetramethyl-1,1'-spirobiindane-based phosphine ligand, and preparation method thereof
US-2021163514-A1 · Jun 3, 2021 · US
3,3,3',3'-tetramethyl-1,1'-spirobiindane-based phosphinooxazoline ligand compound, preparation method and uses of the same
US-2021079030-A1 · Mar 18, 2021 · US
Spiroketal-based C2-symmetric scaffold for asymmetric catalysis
US-10565015-B2 · Feb 18, 2020 · US
Selective catalysts for spinetoram production
US-10507461-B2 · Dec 17, 2019 · US
Method for the production of praziquantel and precursors thereof
US-10273213-B2 · Apr 30, 2019 · US
Spiroketal-Based C2-Symmetric Scaffold For Asymmetric Catalysis
US-2019084995-A1 · Mar 21, 2019 · US
Method for the production of praziquantel and precursors thereof
US-2018251428-A1 · Sep 6, 2018 · US
Selective catalysts for spinetoram production
US-2017252735-A1 · Sep 7, 2017 · US
Phosphine ligands for catalytic reactions
US-9669399-B2 · Jun 6, 2017 · US
Phosphine ligands for catalytic reactions
US-2016263566-A1 · Sep 15, 2016 · US
Phosphine ligands for catalytic reactions
US-9381508-B2 · Jul 5, 2016 · US
Phosphine ligands for catalytic reactions
US-9266913-B2 · Feb 23, 2016 · US
Phosphine ligands for catalytic reactions
US-2015360215-A1 · Dec 17, 2015 · US
Phosphine ligands for catalytic reactions
US-9200021-B2 · Dec 1, 2015 · US
Phosphine ligands for catalytic reactions
US-2015152126-A1 · Jun 4, 2015 · US
Phosphine ligands for catalytic reactions
US-8975443-B2 · Mar 10, 2015 · US