It says it's an empty container, then there's speculation that all sorts of stuff could be used - pepper spray, smoke, crowd control agents, biological agents, chemical agents, obscurants, marking agents, dyes and inks, chaffs and flakes.
It's a catch-all statement - that's how patents are written.
Making a chemical warfare boogeyman out of this will be as successful as the attempt about 9 months ago by the European press to say the US's use of White Phosphorus projectiles and grenades amounted to chemical warfare.
Regardless, it is incredibly stupid to use those terms.
You might as well patent an explosive and state that it can be use for terrorism!