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Old 12th Jan 2013, 12:49 am   #175
emeritus
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Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 5,316
Default Re: Another unusual plug and some other questions

I couldn't find a Crabtree patent either. Perhaps they had a licence under someone else's patent. On the other hand, if the marking said "patent pending" or the like, then at that date, patents that were not granted were not published. It would be possible to find out if Crabtree had applied for any patents at that time, but this would involve personal inspection of the weekly Patent Office Journal at the SRIS in St Pancras, London, and the only details would be the title and the applicant's name.
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