We all like to think that we make an impact on others and that we are memorable. The problem is that many folks meet and interact with so many people, even in one year's time, that it's highly unlikely that they can remember everyone whom they've met.
That's why it's essential for business owners to keep their and their company's names in front of past, current, and potential clients on a regular basis.
There are a number of ways to remind clients of your existence. You can do as I do and send ecards on a regular basis; you can send regular newsletters; you can send articles of interest and/or invitations to events that would interest your clients; you can take your clients for lunch or drinks, etc.