Abstract
THE fifty-sixth report of the Comptroller-General of Patents, Designs and Trade Marks for 1938, records a further increase in the number of patents, applications having increased from 36,266 in 1937 to 37,973 in 1938, with increases in the number of provisional and complete specifications from 21,745 and 22,215, respectively, to 26,696 and 23,098. In regard to the trend of inventions, the synthetic production of artificial wool and rubber, the latter by the polymerization of diolefines and halogenated diolefines, continues to be prominent. New developments in the very active field of synthetic resins are the use of polyamide resins for making artificial yarn and the use of resins in water purification by ionic exchange. Antioxidants or stabilizers for rubber, oils, fats, soaps, aldehydes and light-sensitive substances are much in evidence. Applications relating to azo and vat dyes decreased in number, but the development of long-chain polymethine dyes for use as photographic sensitizers is actively sustained.
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Inventions and Patents in Great Britain*. Nature 144, 641–642 (1939). https://doi.org/10.1038/144641b0
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DOI: https://doi.org/10.1038/144641b0