The only way you could conceivably get sued for publishing such an article would be if you were under a formal contract, like a signed non disclosure agreement where you obtained confidential intellectual property and improperly disclosed it, or if you broke into some guy's office and stole the information! Publish away...unless, like I said, you are planning to use the info in a commercial product. In that 2nd case, you should work with a patent lawyer to see what is protected, what is not protected in the patent claims, and what is a "questionable" claim that probably would not withstand court scrutiny.
People patent anything. I still laugh having seen someone who got a US patent for a quarterwave microstrip directional coupler around 10 years ago! I think Matheei, Young and Jones showed how to do the exact same thing 20 years earlier, and ANYONE in the industry knew that!!!