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An expired patent is a patent that is no longer in force, either because it reached the end of its legal term or because a patent renewal fee went unpaid. Once a patent expires, the invention it protected enters the public domain and anyone can use it.
In most countries a patent runs up to 20 years from its filing or priority date. Renewal fees keep a patent alive up to that limit; they do not push it past it.
Some patents do run longer. A supplementary protection certificate can extend protection for certain regulated products, mostly pharmaceutical. The United States grants patent term extension for a similar purpose, and several jurisdictions add patent term adjustment when the office's own delays held up examination.
The three terms describe different routes to the same outcome, and they are not interchangeable. Only some of them are reversible.
| Term | What happened | Reversible? |
|---|---|---|
| Expired | The patent reached the end of its maximum term | No |
| Lapsed | A patent renewal fee was not paid in time | Sometimes, within a grace or restoration period |
| Abandoned | The applicant or owner stopped pursuing or maintaining it | Sometimes, depending on the jurisdiction and the stage |
The difference matters commercially. A patent that expired at the end of its term was always going to end on that date. A patent that lapsed for an unpaid patent renewal fee ended early, and that is the avoidable case.
Sometimes, and only within a limited window. Most jurisdictions offer a grace period first, during which the fee can still be paid with a surcharge, typically up to six months.
After the grace period closes, some offices allow restoration or reinstatement. It is discretionary rather than automatic, it is time limited, and it usually requires showing that the failure to pay was unintentional. Restoration rules differ enough between jurisdictions that a portfolio lapsing in several countries at once may be recoverable in some and lost in others.
Check the register of the office that granted it. Status shown in a commercial database can lag the official record, and a patent that appears granted may already have lapsed for non-payment.
A patent inside a grace period has a patent renewal fee outstanding. In many jurisdictions it stays in force until the grace period expires, and paying the fee with the surcharge returns it to good standing. The treatment differs between offices, so the register for that jurisdiction is the answer.
