People v. Isaac. 09PDJ050. June 10, 2009. Attorney Regulation. The Presiding Disciplinary Judge approved a Conditional Admission of Misconduct submitted by the parties and suspended John L. Isaac (Attorney Registration No. 11387) from the practice of law for a period of three years, effective June 10, 2009. Respondent knowingly failed to act with reasonable diligence and communicate with three separate clients who had retained him to handle their patent matters. He also negligently failed to safekeep their funds and engaged in the unauthorized practice of law when he filed pleadings in one of the matters following his suspension by the United States Patent and Trademark Office. Respondent’s misconduct constituted grounds for the imposition of discipline pursuant to C.R.C.P. 251.5 and violated Colo. RPC 1.3, 1.4(a)(3), 1.15(a), and 5.5(a)(1).