PATENT OIL FILTER
USE BY THE ADMIRALTY. The letters patent for a filter which, it was stated, enabled lubricating oil to be used over and over again, was extended for five years by Mr Justice Simonds in the Chancery Division, state a London correspondent. The petition was brought in by Dr Henry Selby Hele-Shaw, the inventor, and Stream Line Filters, Limited, of Battersea. It was claimed that the nature of the invention was such that a long period of practical experimental work was necessary to ascertain how it could be exploited to the best advantage, and that the commercial development of the patents had been retarded. The British Empire imported 150,000,000 gallons of lubricating and insulating oil per annum, and, as the filter enabled the broken-down parts of the used oil to be efficiently separated from the 95 to 97 per cent of good oil still remaining, this resulted in a substantial measure of public economy. The apparatus was being used by the Royal Air Force, the Admiralty, the Central Electricity Board and many others.
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https://paperspast.natlib.govt.nz/newspapers/WAITA19390103.2.90.8
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Wairarapa Times-Age, 3 January 1939, Page 7
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175PATENT OIL FILTER Wairarapa Times-Age, 3 January 1939, Page 7
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