Abstract: A method of detecting a level of anesthetic agent in an anesthesia vaporizer is disclosed. The anesthetic agent forms a column of liquid within an external indicator; the method projects a beam of light into the external indicator. The method further receives the beam of light after the beam of light has traveled through the column of liquid, and detects when the level of anesthetic agent drops below a predetermined level.

Abstract: In the toner cartridge recycling and remanufacturing industry, used xerographic toner cartridges are reconditioned and refilled with toner. There are various types and models of toner cartridges, each having unique physical properties. The present invention is directed to the reassembling of toner cartridges that may not have sufficient securing surfaces to allow the cartridge to be physically held together using an external securing device. The present invention will also enable the toner cartridges to be more efficiently remanufactured by allowing a quick connect or disconnect during the assembly or disassembly process.