Nicotine patch patent expiration transdermal nicotine patch patent expired date?

There isn’t a single “the nicotine patch patent” expiration date. A transdermal nicotine patch rests on a family of patents held by different companies (e.g., Alza/J&J, 3M, etc.), filed across the 1970s–1990s and in multiple countries. Each patent has its own expiration date (usually 20 years from the earliest non‑provisional filing date, plus any term adjustments or extensions). Because there are many patents covering different aspects (the patch itself, the adhesive matrix, formulation, delivery system, etc.), theyexpired at different times—generally over the 2000s to early 2010s in the US, with some variation in other jurisdictions.

If you want a precise expiration date, I can look up a specific patent number (or the exact product name) and tell you the exact date. Please tell me:
- the patent number (or the product name and company), and
- the country/region you’re interested in.

I can then give you the exact expiration date for that patent (and note if there are any extensions or regulatory exclusivities involved).