Organic compounds with soluble groups
US-2017369773-A1 · Dec 28, 2017 · US
Spiro-condensed ring systems
Spiro-condensed ring systems · 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 | C07D221/20 |
| Official title | Spiro-condensed ring systems |
| Display label | Spiro-condensed ring systems |
| Total patents | 295 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 14 |
| 2016 | 15 |
| 2017 | 31 |
| 2018 | 24 |
| 2019 | 36 |
| 2020 | 32 |
| 2021 | 30 |
| 2022 | 33 |
| 2023 | 20 |
| 2024 | 29 |
| 2025 | 23 |
| 2026 | 8 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Pyridine derivatives
US-2017362209-A1 · Dec 21, 2017 · US
Antiviral compounds
US-9840465-B2 · Dec 12, 2017 · US
Biaryl derivative as gpr120 agonist
US-2017349594-A1 · Dec 7, 2017 · US
Antidiabetic substituted heteroaryl compounds
US-9834563-B2 · Dec 5, 2017 · US
Metal complexes
US-9831448-B2 · Nov 28, 2017 · US
Amido Compounds And Their Use As Pharmaceuticals
US-2017334847-A1 · Nov 23, 2017 · US
Dopamine d3 receptor antagonist compounds
US-2017334895-A1 · Nov 23, 2017 · US
Materials for electronic devices
US-2017331053-A1 · Nov 16, 2017 · US
Compound having acridan ring structure, and organic electroluminescent device
US-9818949-B2 · Nov 14, 2017 · US
Polycyclic compound and organic eletroluminescence device including the same
US-2017324037-A1 · Nov 9, 2017 · US
Condensed cyclic compound and organic light-emitting device including the same
US-2017321118-A1 · Nov 9, 2017 · US
AZA spiro alkane derivatives as inhibitors of metalloproteases
US-9801877-B2 · Oct 31, 2017 · US
Compounds for electronic devices
US-9780311-B2 · Oct 3, 2017 · US
Phenoxyethyl cyclic amine derivatives and their activity as EP4 receptor modulators
US-9776964-B2 · Oct 3, 2017 · US
Organic electroluminescent material and organic optoelectronic device
US-2017263871-A1 · Sep 14, 2017 · US
Alpha-cinnamide compounds and compositions as HDAC8 inhibitors
US-9745253-B2 · Aug 29, 2017 · US
Hepatitis b antiviral agents
US-2017217974-A1 · Aug 3, 2017 · US
Aryl dihydropyridinones and piperidinone mgat2 inhibitors
US-2017216263-A1 · Aug 3, 2017 · US
Substituted spiropiperidinyl compounds useful as GPR120 agonists
US-9708270-B2 · Jul 18, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C07D221/20?
- CPC C07D221/20 is the Cooperative Patent Classification code for “Spiro-condensed ring systems.”
- How many patents are filed under CPC C07D221/20 (Spiro-condensed ring systems)?
- Our database includes 295 publications tagged with this CPC code.
- Is patent activity under CPC C07D221/20 growing?
- Publication counts under this code: 29 in 2024 vs 23 in 2025 (latest complete years).