The litigation over this one shut down an entire functioning company and a lot of people lost their jobs. The companies that were sued by the patent holders provided "simulated neon" with products that did not resemble the diagrams in any way, other than the real general theme of "a translucent tube/rod/whatever backlit by LEDS such that it looked like neon".
http://www.google.com/patents/US6361186
The litigation over this one shut down an entire functioning company and a lot of people lost their jobs. The companies that were sued by the patent holders provided "simulated neon" with products that did not resemble the diagrams in any way, other than the real general theme of "a translucent tube/rod/whatever backlit by LEDS such that it looked like neon".