Here's how to look each rose up:
Go to helpmefind
www.helpmefind.com
to roses
to search for roses
and enter the name
Gemini.
There you'll find that the 'real' name is JACnepal

Take that name to Google, to the even more page where there's a patent search feature. Go to advanced search, use the JACnepal and limit patent search to a few years before the rose was introduced (from helpmefind) and now.
Before you'll see linked the google page that emerges and you can down load it to see the full patent application and get the date of expiration (twenty years after intro) from there.

Here is a link that might be useful: JACnepal link

Coincidently a friend and I were talking about this very subject the other day. Generally speaking does anyone know how long patents last on roses?

patents granted prior to l995 last 17 years. Those granted in l995, and after, are good for 20 years

I found this answer on another board...

I just wondered if anyone kept a list of roses whose patents were expiring.....???

HMF usually has patent years on roses if the patent is still in effect.
Why would you not want to buy a rose whose patent expires soon? Just wondering...

Same question as triple_b. What difference would it make to buy or not buy a rose whose patent is expiring soon?

I've never seen a list like you describe. You would have to put that together from the patent search.

I think Gbebeh just meant you might get a better price for a rose on the list if you waited 'til next year, after the patent expired.

Or, when patented, the sellers know they'll make more money on each plant so they take better care of them. When they know a rose is going out of patent and it's no secret when that is, they stop producing the rose for sale so that the year that the patent expires, there aren't as many/any for sale.
Often the tendency to stop producing roses happens well before the patent expires because some people only want the newest.

I'll admit that I only buy non-patented roses, or if they are patented, they are almost impossible to get (for example, Perfume Tiger). I look up every rose I plan on purchasing on the US Patent database to see its status. Then again, I also buy unrooted cuttings of roses that are VID rather than buy them already rooted, but with the chance that they may be virused.

mike_rivers you figured out my thinking. about 1/2 the roses I bought this year were unpatented and much cheaper than my patented roses. I was just thinking that if a really great rose had an expiring patent I could wait until next year and hopefully buy it much cheaper!

I'll play around with helpmefind....
thanks for all the input!

gbebeh