Have you considered filing trade marks to protect your brands? Registered trade marks can add real value to your business. Trade marks may be especially important if you are targeting consumers were reputation drives sales.
Your brands may be very important. Trade marks protecting your brands may be your most valuable asset to a purchaser of your business.
Some important technology trade marks include IPOD® and PRIUS®. I bet you have heard great things about the products sold under these trade marks. Apple® and Toyota® make great products but it is their reputation that sells their products.
Trade marks may be especially important when your patents lapse or your applications fail because you can still leverage your trade marks that you have built up during the life of your patents.