Abstract: The present disclosure provides a respiratory protection device that includes a valve assembly operable between an open configuration and a closed configuration. In some exemplary embodiments, the respiratory protection device includes an elastomeric seal, and a valve assembly and a breathing air source component are in sealing engagement with the elastomeric seal when the valve assembly is in the closed configuration.

Abstract: A respiratory protection device that includes a valve assembly operable between an open configuration and a closed configuration. In some exemplary embodiments, the respiratory protection device includes an elastomeric seal, and a valve assembly and a breathing air source component are in sealing engagement with the elastomeric seal when the valve assembly is in the closed configuration.

Abstract: The present disclosure provides a respiratory protection device that includes a valve assembly operable between an open configuration and a closed configuration. In some exemplary embodiments, the respiratory protection device includes an elastomeric seal, and a valve assembly and a breathing air source component are in sealing engagement with the elastomeric seal when the valve assembly is in the closed configuration.

Abstract: A respiratory protection device that includes a valve assembly operable between an open configuration and a closed configuration. In some exemplary embodiments, the respiratory protection device includes an elastomeric seal, and a valve assembly and a breathing air source component that are in sealing engagement with the elastomeric seal when the valve assembly is in a closed configuration.

Abstract: The present disclosure provides a respiratory protection device that includes a valve assembly operable between an open configuration and a closed configuration. In some exemplary embodiments, the respiratory protection device includes an elastomeric seal, and a valve assembly and a breathing air source component are in sealing engagement with the elastomeric seal when the valve assembly is in the closed configuration.

Abstract: Improved dispensing devices (100) and methods are provided that include a hollow barrel (102) containing the composition to be dispensed along with a piston (120, 220, 320, 420) received in one end (104) of the barrel (102) for dispensing the composition from the opposite end (106) of the barrel (102). At least one tortuous groove (200, 202, 204, 226, 326, 426, 436) extends across the side of the piston (120, 220, 320, 420) and communicates with the exterior of the barrel (102). The groove (200, 202, 204, 226, 326, 426, 426, 436) allows both air and the composition to travel along the side of the piston (120, 220, 320, 420) as the piston advances into the barrel (102). By permitting passage of both air and the composition, the groove (200, 202, 204, 226, 326, 426, 436) eliminates air pockets in the composition while alleviating pressure in the barrel (102) as the piston (120, 220, 320, 420) advances.

Abstract: Improved dispensing devices (100) and methods are provided that include a hollow barrel (102) containing the composition to be dispensed along with a piston (120, 220, 320, 420) received in one end (104) of the barrel (102) for dispensing the composition from the opposite end (106) of the barrel (102). At least one tortuous groove (200, 202, 204, 226, 326, 426, 436) extends across the side of the piston (120, 220, 320, 420) and communicates with the exterior of the barrel (102). The groove (200, 202, 204, 226, 326, 426, 426, 436) allows both air and the composition to travel along the side of the piston (120, 220, 320, 420) as the piston advances into the barrel (102). By permitting passage of both air and the composition, the groove (200, 202, 204, 226, 326, 426, 436) eliminates air pockets in the composition while alleviating pressure in the barrel (102) as the piston (120, 220, 320, 420) advances.

Abstract: The invention features a dispenser tip filter assembly for dispensing fluid compositions, especially dental compositions, containing solid particles. The assembly includes a dispenser tip comprising a filter housing chamber and an exit orifice, and a filter unit positioned within the filter housing chamber in front of the exit orifice. The filter unit has one or more slots with a width less than the diameter of the exit orifice.