Claims and Specification
Claim construction
Claims are construed in light of the specification, but embodiments in the description do not automatically limit the claims. The claim must be clear, supported by the description, and concise. Terms should be defined if they have no ordinary meaning in the art. Functional language is allowed where the specification provides adequate structure or examples; otherwise it may be unclear or overbroad.
Support and unity
The description must support the full scope of the claim. A genus claim needs enough representative examples or a structural definition to make the genus credible. Unity of invention is assessed at the claim level; independent claims in different categories may need a technical link. The specification should also disclose the best mode known to the applicant under applicable practice.
Worked example
A claim states 'a polymer having improved heat resistance.' The description gives one example of a specific polyimide but no definition of 'improved' or other polymers. The claim is unclear and unsupported as to the genus. A revised claim to 'a polyimide comprising repeating units A and B, having a glass transition temperature above 200°C' is clearer and supported by the example and test data.
Traps
Do not import every embodiment into the claim; that narrows scope unnecessarily. Do not use relative terms without a benchmark. Do not assume a broad genus is supported by one working example. Check that amendments to claims have literal or inherent support in the specification and drawings.