Drospirenone paten?

Do you mean patents related to drospirenone (the progestin used in Yasmin/Yaz)? I can help with a general overview or with specific patent numbers and expiry dates. A few quick questions to tailor it:

- Are you looking for the chemical patent (synthesis/production), or formulation patents (e.g., drospirenone combined with ethinyl estradiol in oral contraceptives)?
- Which jurisdictions matter to you (US, EU, worldwide)?
- Do you want historic background or current status (expired vs still-active patents)?

In the meantime, here’s a quick guide to what’s typically in the drospirenone patent space:

- Core chemical patents: Cover the synthesis and composition of drospirenone itself. These were filed by the developers (historically Bayer/Schering and successors) in the late 1980s to 1990s.
- Formulation patents: Cover drospirenone with ethinyl estradiol in oral contraceptives (brand-line products like Yasmin/Yaz). These often claim specific tablet formulations, dosing regimens, and manufacturing methods.
- Other patents: Use in other indications, alternative dosage forms, or extended-release/combination products.

How to find them quickly:
- Google Patents, Espacenet (European Patent Office), USPTO Patent Full-Text, and WIPO Patentscope are good starting points.
- Search strategies:
- For chemical patents: use “drospirenone” as the main term, plus “synthesis,” “process,” or “preparation.”
- For formulations: search “drospirenone” AND “oral contraceptive” OR “ethinyl estradiol” OR “tablet” or “combination.”
- Look for assignees like Bayer, Schering, Berlex, etc., and check patent families across jurisdictions.
- Useful tips:
- Use synonyms or alternate spellings you might see in patents.
- Check the status and family members to see expiry dates and whether any continuations or divisional patents exist.

If you tell me your preferred jurisdiction and whether you want a broad landscape or specific patent numbers, I can help assemble a more targeted list.