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”.
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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.
9 January 1980
On 9 January 1980, the European Patent Office announced the first grants of European patents in the European Patent Bulletin 1980/01.
9 January 1931
On 9 January 1931, Thomas Edison filed his final patent application, baased on an earlier application filed in 1926. It was granted posthumously on 16 May 1933, as US Patent No. 1,908,830 for a “Holder for article to be electroplated”.