Dating british patent numbers


17-Jun-2020 13:07

The 1860 Companies Act established 'Limited' companies.

The use of 'Ltd' after a company name gained favour after 1880.

This starts in the year of Mohammed’s flight from Mecca to Medina in the Western year AD 622 and the years are based on the lunar calendar of 354 days.

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Other letters identified the day and month of registration, the material and bundle number.

Catalogues that do not mention purchase tax may well be pre- 1939.

Islamic metalwork may be dated and if so it is likely to use the Moslem calendar.

The numbers can be used to assess the first year of manufacture from these approximate figures showing the first numbers issued each year :- (Dating of numbers derived from lists of files held by the British Library ( and The Public Record Office.

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Numbers after 1933 are taken from the graph below, plotted from PRO files.

not now available) The National Archives, Kew, Richmond, Surrey, TW9 4DU, United Kingdom tel: 44 (0)20 8876 3444; fax: 44 (0)20 8392 5286.



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