Tribenzotriquinacene with axial aryl group and method for preparing the same
US-2025250215-A1 · Aug 7, 2025 · US
changing the number of rings
changing the number of rings · 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 | C07C5/31 |
| Official title | changing the number of rings |
| Display label | changing the number of rings |
| Total patents | 53 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 8 |
| 2016 | 6 |
| 2017 | 5 |
| 2018 | 11 |
| 2019 | 6 |
| 2020 | 2 |
| 2021 | 1 |
| 2022 | 4 |
| 2023 | 5 |
| 2024 | 3 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for producing limonene and composition containing limonene
US-12215076-B2 · Feb 4, 2025 · US
Process for preparing limonene and composition containing limonene
US-12049441-B2 · Jul 30, 2024 · US
Ruthenium-based metathesis catalysts, precursors for their preparation and their use
US-2024116039-A1 · Apr 11, 2024 · US
Ruthenium-based metathesis catalysts, precursors for their preparation and their use
US-11918985-B2 · Mar 5, 2024 · US
Process for making [1.1.1]propellane
US-11724971-B2 · Aug 15, 2023 · US
Method for producing limonene and composition containing limonene
US-2023167041-A1 · Jun 1, 2023 · US
Ruthenium-based metathesis catalysts, precursors for their preparation and their use
US-2023149911-A1 · May 18, 2023 · US
Process for preparing limonene and composition containing limonene
US-2023144944-A1 · May 11, 2023 · US
Ruthenium-based metathesis catalysts, precursors for their preparation and their use
US-11577232-B2 · Feb 14, 2023 · US
Process for making [1.1.1]propellane
US-2022324775-A1 · Oct 13, 2022 · US
Syntheses, characterizations, and applications of heli-acenes
US-11319266-B2 · May 3, 2022 · US
Ruthenium-based metathesis catalysts, precursors for their preparation and their use
US-2022118434-A1 · Apr 21, 2022 · US
Ruthenium-based metathesis catalysts, precursors for their preparation and their use
US-11241680-B2 · Feb 8, 2022 · US
Aromatization process using heavy aromatic circulation
US-11008266-B2 · May 18, 2021 · US
Syntheses, characterizations, and applications of heli-acenes
US-2020354294-A1 · Nov 12, 2020 · US
Aromatization process using heavy aromatic circulation
US-2020002250-A1 · Jan 2, 2020 · US
Aromatization process using heavy aromatic circulation
US-10487026-B2 · Nov 26, 2019 · US
Aromatization process using heavy aromatic circulation
US-2019315666-A1 · Oct 17, 2019 · US
High density renewable fuels from zizaenes
US-10323198-B1 · Jun 18, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C07C5/31?
- CPC C07C5/31 is the Cooperative Patent Classification code for “changing the number of rings.”
- How many patents are filed under CPC C07C5/31 (changing the number of rings)?
- Our database includes 53 publications tagged with this CPC code.
- Is patent activity under CPC C07C5/31 growing?
- Publication counts under this code: 3 in 2024 vs 2 in 2025 (latest complete years).