Tetracarboxylic dianhydride, polyamic acid, polyimide, methods for producing the same, and polyamic acid solution
US-10513582-B2 · Dec 24, 2019 · US
Chemistry & Metallurgy
Chemistry & Metallurgy · 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 | C07D307/89 |
| Official title | — |
| Display label | Chemistry & Metallurgy (mapped technology topic) |
| Total patents | 126 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 18 |
| 2016 | 12 |
| 2017 | 17 |
| 2018 | 11 |
| 2019 | 15 |
| 2020 | 10 |
| 2021 | 12 |
| 2022 | 7 |
| 2023 | 7 |
| 2024 | 11 |
| 2025 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Monomer, polymer, compensation film, optical film, and display device
US-2019031831-A1 · Jan 31, 2019 · US
Catalyst arrangement with optimized void fraction for the production of phthalic acid anhydride
US-10155713-B2 · Dec 18, 2018 · US
Process for the preparation of organic halides
US-2018282247-A1 · Oct 4, 2018 · US
Method for producing carboxylic acid anhydride, method for producing carboxylic imide, and method for manufacturing electrophotographic photosensitive member
US-10065969-B2 · Sep 4, 2018 · US
Disubstituted maleic anhydrides with altered kinetics of ring closure
US-10059681-B2 · Aug 28, 2018 · US
Process for producing 4-azidosulfonylphthalic anhydride
US-10005751-B2 · Jun 26, 2018 · US
Phthalonitrile compound
US-2018155276-A1 · Jun 7, 2018 · US
Oxidation catalyst with saddle-shaped support body
US-9925526-B2 · Mar 27, 2018 · US
Catalyst system for oxidation of o-xylene and/or naphthalene to phthalic anhydride
US-9914716-B2 · Mar 13, 2018 · US
Catalyst system for oxidizing o-xylol and/or naphthalene into phthalic anhydride
US-9868713-B2 · Jan 16, 2018 · US
Multi-zoned catalyst system for oxidation of o-xylene and/or naphthalene to phthalic anhydride
US-2018008962-A1 · Jan 11, 2018 · US
Dinadic phenyl amine reactive endcaps
US-2018009949-A1 · Jan 11, 2018 · US
Process for Producing 4-Azidosulfonylphthalic Anhydride
US-2017369464-A1 · Dec 28, 2017 · US
Improved process for the preparation of a benzene compound
US-2017355710-A1 · Dec 14, 2017 · US
Dianhydrides, polyimides, methods of making each, and methods of use
US-9840514-B2 · Dec 12, 2017 · US
Alcohol compound and method for producing same, method for producing lactone compound, (meth)acrylate ester and method for producing same, polymer and method for producing same, and resist composition and method for producing substrate using same
US-9823563-B2 · Nov 21, 2017 · US
Catalyst Arrangement With Optimized Void Fraction For The Production Of Phthalic Acid Anhydride
US-2017320803-A1 · Nov 9, 2017 · US
Process for preparing phthalic anhydride
US-9765046-B2 · Sep 19, 2017 · US
Plate-type reactor with in-situ injection
US-9738582-B2 · Aug 22, 2017 · US
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C07D307/89?
- CPC C07D307/89 is the Cooperative Patent Classification code for “Chemistry & Metallurgy.”
- How many patents are filed under CPC C07D307/89 (Chemistry & Metallurgy)?
- Our database includes 126 publications tagged with this CPC code.
- Is patent activity under CPC C07D307/89 growing?
- Publication counts under this code: 11 in 2024 vs 6 in 2025 (latest complete years).