Patenting Chemical Compositions and Formulations
Last revised:
April 19, 2026
Chemical inventions — new compounds, formulations, catalysts, polymers, and coating systems — are among the strongest patents available because composition-of-matter claims cover the substance itself, regardless of how it is made or used. A composition claim on a novel polymer covers every use of that polymer by anyone — an extraordinarily broad right.
What Is Patentable
New chemical entities (NCEs). A novel compound with a defined chemical structure. The strongest claim type in chemistry — it covers the compound regardless of application, formulation, or manufacturing method.
Compositions and formulations. Specific combinations of known compounds that produce an unexpected or superior result. The combination must be non-obvious — merely mixing known ingredients with predictable outcomes is not patentable.
Polymorphs, salts, and esters. New crystalline forms or derivatives of known compounds. Patentable in most jurisdictions if they demonstrate improved properties. India's Section 3(d) requires enhanced therapeutic efficacy for pharmaceutical derivatives — not just improved physicochemical properties.
Catalysts. Novel catalytic compositions, supported catalysts, and catalytic processes. The catalyst composition is claimable separately from the process it enables.
Processes. Novel methods of synthesis, purification, or formulation. Process claims complement composition claims — covering the manufacturing step even if the final product is known.
Claim Drafting for Chemistry
Use Markush groups for genus claims covering families of related compounds. "A compound of Formula I wherein R₁ is selected from the group consisting of..." covers all permutations within the defined substituent groups.
Specify ranges, not points. Claim "5–15% by weight" rather than "10%." Support the full range with experimental data across the range in the specification.
Include composition and process claims. A composition claim covers the substance; a process claim covers the method of making it. Together, they provide maximum protection.
Provide working examples. Chemical patents require more detailed experimental support than mechanical patents. Include synthesis procedures written in past tense with specific quantities, conditions, and characterisation data (NMR, FTIR, XRD, DSC as appropriate).
Jurisdiction Comparison
Sources
- USPTO — MPEP § 2111-2116 — US guidance on claim interpretation and enablement requirements for chemical compositions
- EPO Guidelines for Examination — Chemical Inventions — EPO examination standards for chemical compositions, Markush claims, and selection inventions
- WIPO — Chemistry and Patents — Global patent considerations for chemical inventions
- Espacenet — Free patent search database useful for chemical prior art searches
Frequently Asked Questions
Can I patent a known compound for a new use?
In most jurisdictions, yes — as a second use claim. The US allows method claims; Europe uses purpose-limited product claims. India is restrictive under Section 3(d) and 3(i).
How do I protect a trade secret formulation that I also want to patent?
Patent the process and the general composition range. Keep the exact formulation parameters (precise ratios, processing conditions, proprietary additives) as trade secrets. The patent protects the invention broadly; the trade secret protects the competitive edge within the patented space.
This article is part of the iInvent Encyclopedia — the world's most comprehensive knowledge base for inventors. It is intended for educational purposes and does not constitute legal advice. For guidance specific to your situation, consult a qualified patent attorney.
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