https://patentbrief.org/company/hymen-l-lipman Plain-English explanations of patents assigned to Hymen L. Lipman, newest first. en-us Sat, 13 Jun 2026 10:10:59 GMT https://patentbrief.org/patent/us/19783/pencil-eraser-combination-lipman Hymen Lipman's 1858 invention that permanently attached an eraser to the end of a wooden pencil, creating the modern writing tool we use today. Tue, 30 Mar 1858 00:00:00 GMT https://patentbrief.org/patent/us/19783/pencil-eraser-combination-lipman