A patent is a time-limited monopoly on a technical invention. In exchange for publishing how your invention works, you get the right to stop others from making, selling, or importing it. In most countries the term is up to 20 years from the filing date. Business ideas, designs, and software alone are rarely patentable.
To be patentable, an invention normally has to be new, involve an inventive step that is not obvious to a specialist, and be industrially applicable. New is strict. If you demonstrate your invention at a trade fair, publish it on your blog, or explain it in a public pitch before filing, you can destroy the novelty yourself. Speak to potential partners under a confidentiality agreement until your application is filed.
Costs come in stages, not once. As an example, imagine a national filing that costs 4,000 including attorney work, then an examination phase of 3,000 spread over two years, then annual renewal fees that start near 100 and rise every year. Extending to five more countries can multiply the total several times, because each country charges its own fees and often requires translations. Real figures depend entirely on where you file, so ask a patent attorney for a quote before you put a number in your plan.
Patent pending means an application has been filed, not granted. It has signalling value, but it is not a granted patent.
The biggest misunderstanding is what a patent gives you. It produces no revenue, and nobody enforces it for you. It gives you the right to sue. If a large competitor copies you, you have to pay for that lawsuit. For many small companies, being faster, keeping a process secret, or building a recognised brand protects the business at lower cost than a patent portfolio. Decide deliberately, not by default.
