For what it's worth, I've spent a few minutes googling and can't find any story that corroborates this. The only US trademark I can find around "kosher gelatin"

For what it's worth, I've spent a few minutes googling and can't find any story that corroborates this. The only US trademark I can find around "kosher gelatin" is by the brand Kolatin, which is apparently certified Kosher.