Digital BW, The Print

> Most of there CIS systems simply run a tube to an empty cart that has 
> been imported and arguably violates an Epson patent.  A CIS, however, 
> can be made without such a cart.  www.Inkrepublic.com appears to use 
> dampers instead of carts at the connection.  I've though such a system 
> would be both superior and avoid the patents.
> 
Can the tubes not be connected to an empty EPSON cartridge? 
Apparently the CIS-makers manufacture their own carts?