I am familiar with the you know solutions patents and the one you refer to is for parallelizing C code and other languages into the flowcharts. Here is a link to the asynchronous design patent called "processing circuits for parallel asynchronous modeling and execution".
https://www.freepatentsonline.com/10181003.html
Interesting, but not great, since I work on something related and I was not aware of any patents in that area. But it should be distinct enough, I hope. (I don't target FPGAs for example, but I have zero experience with patents, so lets see how that works out)
It's not really similar to ladder logic but in those days it did the same thing, controlled machines. In ladder logic all of the rungs of the ladder are evaluated all of the time but with flowcharts only the necessary part of each flowchart is executed as the machine cycles.
https://www.freepatentsonline.com/9003383.html