Illustrator :: How To Make Stipple Gradient In CS4

How can I make a stipple gradient in Illustrator CS4? In drawings for design patents, the US Patent office requires, where shading is needed for clarity, stippled gradients.  (Note: line gradients can be used unless the design incorporates lines that would be obscured/confused by the use of line gradients.) Generally, the lighting is assumed to be from the top left and the shading is implemented accordingly.Other gradient effects are forbidden. Illustrator (version 8 -- yes, I've used it swimmingly for 10 years and only recently upgraded to CS4) has provided for stipple gradients.  That is, you could make a 20% to 120% stipple for example.  Now, with CS4, I can't see how to create a stippled gradient.