Ronald W. Krohn of Marlboro, formerly of Waltham, January 2, 2005, age 71. Beloved husband of forty-eight years to Ann (Quinn) Krohn, devoted father of Karen Poirier of Shrewsbury, and Laurie Krohn-Andros and her husband Steve Ardros of North Oxford. A graduate of Wentworth Inst., he was a design engineer for many years at Agfa Corp. of Wilmington, Ma. Mr. Krohn was an accomplished inventor and had many patents registered in Washington, D.C. A memorial service will be scheduled at a later date. Memorial donations in his memory may be made to the Leukemia Foundation, 495 Old Connecticut Path, Framingham, Ma. 01701. Veteran of the U.S. Coast Guard. Arrangements by Commonwealth Cremation Service of BOSTON.