Some observations: 

 The first true Volcano Kettle was made by George Marris & Sons Ltd of Birmingham, England in the 1920's. These are known as the Sirram Volcano Kettle.  

 The Marris Co acknowledged that the original concept came from a New Zealander (probably John Ashley Hart who started the Thermette Co in New Zealand in 1929). 

 The Volcano Kettles were intially made from brass and copper and were marked: 'The Sirram Volcano Quick Boil Kettle, Regd Td Mk, Registered Design No 731794'. The records held by the British Library and British Public Record Office show that this Design Number was issued in 1928. In the 1930's Marris switched to aluminium. 

 The claim by Kelly Kettles on their website that the original Volcano Kettle was made in a little farm on the shores of Lough Conn, County Mayo in the 1890's is interesting but with no evidence. Yes they were in wide use by fishermen in Ireland from the 1930's but these were most likely the Sirram Volcano Kettle which was sent to Ireland in large numbers. If Kellys have been made for so long why are there no old ones? Has anyone ever seen one? Why is one not shown on the Kelly website? Surely if they were so popular and mnade in such numbers there should be a plethora of old examples. The image on the Kelly website "Pictured above, the late Jim Kelly (grandfather of Patrick and Seamus, seated center) enjoys lunch on Lough Conn with a party of Welsh angler in 1964", clearly shows a Sirram Volcano Kettle. Even the unique Sirram inner conical flask can be clearly seen. The current Kelly Kettle that is so vigorously protected by Kellys is, apart from size, 99% identical to the 1930's aluminium Sirram. 

 The US Trade Mark for 'Volcano Kettle' was not applied for by Kellys until 14th April 2007. Even if Kellys were able to argue that they possess a Trademark, they would probably lose any legal battle due to the fact that the term 'Volcano Kettle' has been in wide public use since 1928 as a general term for this type of kettle. This is known in legal parlance as 'genericide' - the process by which trademark rights are diminished or lost as a result of common use. The fact that this term has been in documented common use and registered as a trade name in 1928 blows the Kelly arguement out of the water. 

 The title in Wikipedia should be 'Volcano Kettle'.