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Hi Kevin


Here is how a patent works. Once a company like Electrolux, Hoover, Kirby and so on files for a patent on a given part, tool, machine, or the improvement of these, they are givwn permission to produce that tool, however, the term is 'patent pending.' The duration between the date the patent is 'filed' and 'granted,' ranges from a few weeks to several years.



 



Most of the tools used with the various Electrolux models did not change from 1934 to 1954. What did change was the rubber trim, and that changed with the color of each model. The rug tool was the only attachment to go through a series of designs, and these were from 1933 to 47. In addition, certain tools were introduced but had a limited run. The reason for this was WWII, which forced all companies to go into "war production," so the motors that were usually made for a vacuum cleaner became, in Electrolux's words, "motors that fight!" This is why the model XXX had such a long run. Interestingly enough it was on September 11, 1944, that Electrolux was given permission by the War Production board to resume, on a limited basis, manufacturing vacuum cleaners for sales to the American people. It was also around this time that Gustaf E. Lofgren thought up the idea of the self ejecting dust bag, which would become the model LX.



 



So it all began with the little dusting brush for the model XII, which is shown here.



 



Alex Taber.  


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