Patent ID: 8308028

Claim:
A dispenser for a gaseous, gas borne or droplet substance comprising a source of the substance, wherein said substance comprises medicament and propellant and said source comprises a reservoir and a release valve, wherein said reservoir comprises: a major portion having a comparatively large cross-section of its substance space and a minor portion provided with an insert which substantially reduces the cross-section thereof so that said minor portion has a comparatively small cross-section of its substance space, the reservoir being translucent or transparent, at the minor portion at least, and the minor portion is at an opposite end of the source from the release valve, so that during use in the valve-down position the medicament flows away from the minor portion and a user inverting the dispenser so it is valve up can observe the level of the substance in the minor portion and can note a comparatively rapid depletion with use of the quantity of substance remaining when the source approaches exhaustion of the substance.