First, some initial background:
http://www.toybotstudios.com/2012/02/microtech-matrix-is-ripping-off-zero.html
In May 2016, a year before these suits were filed, Marfione and Microtech stopped selling their infringing models after KAI sent them a cease and desist letter regarding their patent (the patent application was made in January 2012 but was not granted until September 2015).
In January 2017, at Shot Show, KAI debuted the Natrix, with several not-so-subtle refrences to Microtech's thievery released a fairly incriminating statement about the whole thing, which they've since taken down (but it’s hard to make things disappear on the internet
http://imgur.com/a/3gaBY )
The ad copy for the Natrix included these gems:
Where have I seen that profile before? That’s right. The new Kershaw Natrix is based on brother brand Zero Tolerance’s 0770, which itself was inspired by the award-winning ZT 0777. The design has—apparently—been the envy of certain other knifemakers. And now we’re taking it back.
...
Now the next time you see this famous knife profile, it will be from a manufacturer that has a right to the design: us.
Tony Sculimbrene basically took that copy and ran with it:
https://web.archive.org/web/2017012...1/the-story-behind-greatest-knife-of-all.html
A few weeks later, Marfione threatened to sue some random guy on Instagram for calling out the 0777 thing
https://external-preview.redd.it/5l...bp&s=31c912eac27d7788f8052e2c2cb28fd981f97c74
10 days later, Marfione and Microtech sued Tony for defamation and "commercial disparagement" related to that blog post (1:17-cv-00046 (W.D. Pa. Feb 17, 2017)).
A month after the suit was filed against Tony, and while it was still pending, Marfione and Microtech sued KAI for defamation, alleging some sort of involvement in Tony's blog post (1:17-cv-00070 (W.D. Pa. Mar 14, 2017)).
Tony eventually agreed to do a retraction (hence the archive.org link) in order to get the case settled.
KAI's motion to dismiss was granted.
Last year, an interesting case was filed: Marfione v. Marfione - 1:20-cv-00178 (W.D. Pa. Jul 06, 2020).
Basically, Microtech and Marfione Custom Knives were incorporated back when Anthony and his ex-wife were still married. Today, they both own 50% of the companies.
Ex-wife sued Anthony for stealing from the companies and making knives to sell in competition with them under the name "Celestial Knives."
Seems that Mr. Marfione decided he no longer wanted to share profits with his ex-wife and tried to do some business behind her back.
The case was resolved in October, and I can't find any sign of "Celestial Knives" on the internet.
There was also a lawsuit filed by Anthony Marfione against his son, Anthony G. Marfione, but it was filed in local Pennsylvania court, so don't have easy access to records. I suspect it has something to do with Heretic Knives, but could be anything.