The patent expiry date for Oxycontin is not explicitly mentioned in the provided sources. However, we can infer from the information in the sources that the patent for Oxycontin has expired or is set to expire soon.

According to the first source, Drug Patent Watch, the patent for Oxycontin is listed as expired. This suggests that the patent has already expired and generic versions of the drug may be available in the market.

The second source, FiercePharma, mentions that the patent for Oxycontin was set to expire on a specific date. However, it does not provide the exact date of expiration. It also states that the FDA was under pressure to delay the approval of generic versions of Oxycontin, which implies that the patent has either expired or is close to expiration.

The third source, Quartz, discusses how pharmaceutical companies utilize patent laws to extend the exclusivity of their drugs, including Oxycontin. Although it does not mention the specific expiry date for Oxycontin, it highlights the tactics used by pharmaceutical companies to delay the entry of generic versions into the market.

In conclusion, while the exact patent expiry date for Oxycontin is not provided in the given sources, it can be inferred that the patent has either expired or is set to expire soon. This suggests that generic versions of Oxycontin may be available or will be available in the near future.

Sources:
[1] Drug Patent Watch - https://www.drugpatentwatch.com/p/tradename/OXYCONTIN
[2] FiercePharma - https://www.fiercepharma.com/legal/oxycontin-patent-expires-tuesday-but-fda-under-pressure-to-stall-generics
[3] Quartz - https://qz.com/1125690/big-pharma-is-taking-advantage-of-patent-law-to-keep-oxycontin-from-ever-dying