On 2007-05-20 13:40:10 +0100, (Andrew
Gabriel) said:

In article ,
Andy Hall writes:
On 2007-05-19 11:19:13 +0100, (Andrew
Gabriel) said:

It is unfortunate that no one produces portable workshop cyclones.
The reason for this is Dyson owns all the patents on making
small cyclones work, and either he has to licence them to someone
to build workshop versions, or he has to do it himself, neither
of which seem to have happened. I suspect the market is too small
to fund even a fraction of the development work which Dyson does
from his domestic sales. There used to be a ruggedised DC04
(looks identical, but is made from a different plastic),
but it cost a fortune.

Actually they do....

http://www.dustdeputy.com/

I don't see anything portable

The small one on the left next to the Shop Vac

. It's very easy to make a large
cyclone and they've been understood for decades. Making a small
cyclone (i.e. portable) which works is where Dyson excels, and
due to his patents on his related invensions, no one else can do
so unless they could find completely different ways of achieving
the same ends.