243 - Sidney Gilchrist THOMAS (1850 - 1885) (4) [1] [2]

On 1 August 1879 THOMAS filed a demande de brevet de perfectionnement for the patent filed on 29 July 1879 (No 242), which itself was a demande de brevet de perfectionnement of the basic patent filed on 6 May 1879.

‍ The fourth patent application filed by THOMAS carried the title of:

Perfectionnements dans la fabrication de l’acier et du fer fondu

The 29 July 1879 and 1 August 1879 applications were merged and a single patent issued on 28 September 1880 under the 1880 Patent Law. [3]

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[1] FamilySearch database

[2] Wikipedia

[3] LU patent No 70

[3] see also No 235, No 240, No 242, No 251, No 259, No 268, No 274, No 275

(12/02/2021)