How to Write a Patent Claim
How to Write a Patent Claim
The claim section is the most important part of any patent application. It defines the exact scope of your legal protectionâand if written poorly, it can make your patent weak or even unenforceable.
What Is a Patent Claim?
A claim is a single sentence that legally describes your invention. It answers the question: "What exactly am I trying to protect?"
Patent claims must be:
- Precise
- Clear
- Technically supported by your description
Types of Patent Claims
- Independent Claim: Stands on its own and defines a broad version of the invention
- Dependent Claim: Refers back to an earlier claim and adds more details or limitations
Example:
- Claim 1: A chair comprising a seat and four legs. (independent)
- Claim 2: The chair of claim 1, wherein the legs are made of bamboo. (dependent)
Basic Structure of a Patent Claim
Most claims follow this pattern: 1. A preamble (introduces the invention) 2. A transitional phrase (e.g., "comprising", "consisting of") 3. A list of elements or steps
Example: "A wireless charging device comprising a power transmitter and a power receiver configured to transfer energy through inductive coupling."
Tips for Writing Strong Claims
- Use broad language in the independent claim (but not too broad)
- Add specific dependent claims to cover variations
- Avoid unnecessary technical jargon
- Make sure every claimed element is explained in the description
Common Mistakes to Avoid
- Making the claim too vague or abstract
- Including features that arenât in the drawings or description
- Using inconsistent terminology (e.g., "sensor" vs "detector")
- Copying from other patents without understanding the language
Do You Need a Lawyer?
You donât have to hire one, but drafting claims is difficult to do well. Consider hiring a Patent Attorney or Patent Agent if:
- The invention is valuable
- You're filing internationally
- You're new to patent writing
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