Do I have a right to display my work and list sponsors?

The owner of the company, where I worked as a graphic designer and creative director for the past 13 years, closed the business in October 2009 -- we no longer had enough contracts to afford to pay the employees and no more sales staff.

Therefore, I started my job search and created a web site to promote my services to both FT potential employers and for freelance customers. On this site, I have posted a "Portfolio" page showing samples of the work I have done over the years and on a "History" page, I have listed the names of sponsors that paid for and advertised in the programs for which I did creative work.

The owner is now in negotiations to sell the company and has said her lawyers will sue me if I do not remove from my site my portfolio materials and the list of companies while working there (again, 13 years worth of employment history).

I have noted their copyright at the end of each description for any and all of the portfolio pieces on the site relating to this former employer's company. Furthermore, some of the web pages and materials I reference through links actually link to their existing sites on the internet, which can be found by anyone searching for them -- they are already in the public.

I am not selling any of these already printed materials, nor claiming ownership of them, but just that I either did the creative myself or oversaw the project as a creative director. Removing these samples of my work would seriously hamper my ability to find new employment or freelance work, especially in today's digital marketplace.