Twenty years ago, people threw their old bills and bank statements out with the trash. Fast forward to today and you’ll find them taking steps to destroy their confidential information before they dispose of it. That’s not a daunting task for an individual but for a doctor’s office or government contractor, disposing of the paper generated in the course of business is a major undertaking. Enter Patriot Shredding, a Rockville company dedicated to the destruction of sensitive and confidential information.  “Our machine is designed for use with classified info,” said co-owner Grant DiGioia.  “It…