The three main US patent types are utility patents (how something works), design patents (how something looks) and plant patents (new plant varieties), with utility patents being by far the most common and commercially valuable. Other countries carve things up differently: Europe protects appearance through registered designs rather than design patents, plant varieties through a separate rights system, and countries like Germany and China add utility models as a faster, shorter-term option. Provisional and non-provisional applications are US filing formats within the utility category, not separate patent types.

Utility patents protect function, design patents protect ornamental appearance, and plant patents protect new asexually reproduced plant varieties. Utility patents last 20 years from filing everywhere, with maintenance or renewal fees required; US design patents last 15 years from grant with no fees, while EU and UK registered designs can last up to 25 years with five-yearly renewals.

A utility patent (simply called a patent in most countries) protects how an invention works or is used, covering processes, machines, manufactured articles and compositions of matter, and lasts 20 years from filing. It's the most commonly filed patent type and requires maintenance or annual renewal fees to stay in force.

A design patent protects the ornamental, non-functional appearance of a product; in the US it lasts 15 years from grant with no maintenance fees, while the equivalent protection in Europe, a registered design, can last up to 25 years with renewals every five years. Apple's smartphone design patents are a well-known real-world example of this category in action.

A design patent (or registered design outside the US) protects how a product looks; a utility patent protects how it works or functions. Many products, particularly consumer electronics, carry both simultaneously, since appearance and mechanism are legally distinct things to protect.

Claims work the same way across utility and design patents in that they define the legal boundary of protection, but utility claims describe function in words while design claims are defined almost entirely by the accompanying drawings. This is why design patent drawings need to be precise and complete.

These are both US filing formats: a provisional application secures a filing date and 12 months of "patent pending" status without starting examination, while a non-provisional application is the formal filing that actually enters examination and can result in a granted patent. A provisional must be followed by a non-provisional within 12 months or the priority date is lost; outside the US, a first national filing plus the Paris Convention's 12-month priority window works the same way.

A patent requires public disclosure in exchange for a time-limited legal monopoly, while a trade secret stays confidential and can protect an invention indefinitely, but only as long as it remains genuinely secret. Coca-Cola's formula is a well-known trade secret; most drug compounds are patents.

A patent protects a functional invention, a trademark protects a brand identifier like a name or logo, and a copyright protects an original creative work such as writing, music or software as written. A single product can involve all three simultaneously, protecting different aspects of the same business.

A patent protects how something works and requires an application and examination process; a copyright protects an original creative expression, like written code, automatically from the moment it's fixed in a tangible form. Copyright can protect a program's source code as written, but not the underlying process or idea it performs.

A patent protects an invention's function or design for a limited term; a trademark protects a brand identifier like a name or logo indefinitely, as long as it's actively used and renewed. Many companies need both: a patent on the technology, a trademark on the brand built around it.

A plant patent is a US category protecting new and distinct varieties of asexually reproduced plants, such as a new hybrid rose or fruit tree cultivar; Europe and most other jurisdictions protect new varieties through a separate plant variety rights system instead. Either way, it's a narrow area rarely relevant outside agriculture and horticulture.

A utility model is a faster, cheaper, shorter-term patent alternative available in countries like Germany, China and Japan, but the US has no direct equivalent. US inventors seeking similar speed typically use a provisional application or the USPTO's Track One prioritised examination programme instead.

A patent is a government-granted right that lets an inventor stop others from making, using or selling their invention without permission, typically for 20 years from filing. In exchange, the inventor publicly discloses exactly how the invention works.