13 January 1942
On 13 January 1942, US Patent No. 2,269,452 was granted to Henry Ford and Eugene Gregorie for “Automobile chassis construction”.
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13 January 1931
On 13 January 1931, US Patent No. 1,788,434 was granted to Leonarde Keeler for an “Apparatus for recording arterial blood pressure”.
13 January 1874
On 13 January 1874, Cyrus G. Spalding, a Boston bookkeeper, received US Patent No. 146,407 for an “Improvement in adding-machines”.
12 January 1886
On 12 January 1886, Lewis H. Latimer received US Patent No. 334,078 for an “Apparatus for cooling and disinfecting”. Often described as a precursor to air conditioning, it pointed toward a future where indoor air could be cooled and made healthier at the same time.
12 January 1932
On 12 January 1932, Siemens-Schuckertwerke secured German Patent No. 567 906 for Wilhelm Klement’s plug and socket concept that became Schuko, a design that most people recognise instantly but rarely think about.