Doctor Curmudgeon®Abraham Lincoln's Patent No. 6,469
By Diane Batshaw Eisman, M.D. FAAP Doctor Eisman is in Family Practice in Aventura, Florida with her partner, Dr. Eugene Eisman, an internist/cardiologist What on earth is Patent No. 6,469? Is it something famous? Well, not exactly. When was it filed? March 10, 1849. When was it issued? May 2