Strong Claims Build Foundation for Patents

A patent gives its owner or a licensee the exclusive right to make, use, or sell the covered invention. But those rights extend only as far as the patent’s claims, which define the precise boundaries of that exclusivity. While a patent document includes a front page, drawings, and a detailed written description (the specification), the claims section is the real heart of the patent. Whether a competing company is brainstorming a strategy to design around the invention or assessing freedom to operate, the claims are the first—and often only—place they look.

A single patent may include one claim or dozens, each numbered and carefully drafted. Their wording, order, and even punctuation can profoundly alter the scope of protection. In some cases, a single misplaced comma can shift the legal meaning of a claim enough to undermine a patent’s enforceability. Because of this, claims are crafted with almost surgical precision.

Patent claims come in two flavors: independent and dependent. Independent claims stand alone. They describe the invention in its broadest defensible form without referencing any other claim. Dependent claims narrow the scope by building on an independent claim. They incorporate every element of the claim they reference, plus one or more additional features. Although narrower, these claims provide important fallback positions. If an independent claim is later invalidated, dependent claims may still be upheld.

US patent law recognizes several categories of patent-eligible subject matter. Three are especially relevant in biopharma.

Articles of manufacture: These include devices, apparatuses, or chemical compounds. In drug development, a new chemical entity (NCE) often falls into this category. Because infringement of such claims is relatively straightforward to detect they are highly valuable.

Compositions of matter: These cover combinations of substances that create a new formulation. A drug–excipient mixture or a novel formulation would fall here. Like claims to an article of manufacture, composition claims tend to be enforceable because the end product is tangible and testable.

Process or method claims: These define how something is made, used, or analyzed. In pharmaceuticals, a method of treatment claim may cover a novel method for treating Parkinson’s disease. Method-of-manufacture claims are also common but can be harder to enforce; it may be difficult to know whether a competitor is using a protected process behind the scenes to improve yield or purity. In some cases, companies may choose trade secret protection for proprietary manufacturing methods rather than rely on process patents.

Ultimately, the strength of a patent hinges on the clarity, breadth, and strategic layering of its claims. Competitors will scrutinize issued claims to identify opportunities to design around them. The more tightly—and thoughtfully—those claims are drafted, the more difficult that becomes. In a field where timelines are long and development costs are enormous, getting them right isn’t just a legal exercise—it’s an essential component of scientific and commercial strategy.