Olopatadine paten?

Do you mean the patent status of olopatadine (the drug) or of a specific product (e.g., Patanol, Pataday, Pazeo)? And in which country are you interested?

Here’s a quick background to help you decide what to look for:
- Olopatadine is a selective H1 antihistamine with mast cell–stabilizing properties used mainly for allergic conjunctivitis (eye drops).
- Brand ophthalmic products include Patanol (0.1%), Pataday (0.2%), and Pazeo (0.7%). Generics are available for some formulations in many markets.
- Patent status is country- and formulation-specific. The main patents covering original olopatadine eye-drop formulations have expired in many jurisdictions, but there can be active patents on:
- specific strengths or formulations
- combination products
- delivery devices or methods
- particular uses or indications
- regulatory data exclusivity in some regions

If you tell me:
- the country or region you're interested in, and
- whether you want the status for the base compound or a particular product/formulation,

I can give you a more precise overview and point you to the relevant patent databases (e.g., USPTO, Google Patents, Espacenet, WIPO Patentscope) to check current claims and expiry dates.