1.   Canon Inc. won a round in its lawsuit charging Nu-Kote Holding Inc. of infringing on a Canon patent through sales of replacement printer cartridges.

2.   H-P has sued companies such as Nu-Kote to protect the highly profitable market for replacement printer cartridges.

3.   It also is conservative in its use of color ink, meaning fewer trips to the store for replacement cartridges.

4.   Printer manufacturers such as Epson and Hewlett-Packard Co. have sued companies such as Nu-Kote to protect the highly profitable market for replacement printer cartridges.

5.   When those people are surfing other alliance sites in search of information on replacement cartridges, DoubleClick could show them an ad for one that matches their computer.