The company I worked for renewed them for another 10 years... You just have to pay the fee.
I know nothing about your company or what you had patented, but if they were utility patents, your company did not renew them. It takes an act of congress to renew a patent after is has gone the full 20-year term and entered public domain, and that extension is usually only a few years. The idea behind this is after 20 years, you should have had enough time to make enough advancements to your original design to justify patenting an improved version of it.
As for the Axis Lock, other manufacturers can use, it, but to my understanding, they can't call it an "Axis Lock" unless they license the use of the name from Benchmade due to a trademark on "Axis" lock in the context of knives.
I don't expect to see too many companies using the Axis Lock, as Benchmade will surely be picky over who they license to. If they license to a crap brand, that crapiness will be associated with Benchmade, and potentially tarnish their "reputation" for "quality". I think big companies like Spyderco are content to continue doing their own thing and not hand money/advertising to Benchmade.
This is all to say that there isn't a new patent already submitted for how the Axis Lock works in the Anthem (no omega springs, replaced with a single coil unit). If the language is done correctly, a new patent
could potentially cover the old design enough to make it difficult for companies to design around.