Eliza Murfey received her first U.S. patent for a lubricant-impregnated packing and bearing material, launching a landmark portfolio in railroad-safety engineering.
On July 12, 1870, Eliza Murfey was granted U.S. Patent No. 105,361, her first patent, for a packing and bearing material consisting of a sheet of paper, leather, or chamois treated with a flocked surface impregnated with lubricating oil. Designed to be inserted into the journal boxes of railroad car axles, the material was intended to keep bearings continuously lubricated and prevent the dangerous overheating known as a 'hot box,' a leading cause of axle failure and derailment in the era of rapidly expanding American railroads.
This patent marked the beginning of one of the most prolific patent portfolios granted to any American woman in the nineteenth century, particularly remarkable because it was concentrated in heavy industrial and mechanical engineering — a field almost entirely closed to women professionally at the time. Later in the same year, the patent was reissued as RE4,210 on December 20, 1870, reflecting the value the assignee placed on securing the underlying claims.
Murfey's entry into mechanical invention came at a pivotal moment for American railroading, as companies sought solutions to the safety and efficiency problems created by friction and heat in wheel bearings. Her work anticipated later industrial lubrication standards and demonstrated that women could contribute directly to core industrial technology, not merely domestic or decorative inventions, challenging contemporary assumptions about the proper domain of female inventors.