US 12,070,768 B2
Piston, cartridge and method of venting a cartridge
Manfred Obrist, Lustenau (AT); Philipp Seiler, Au (CH); and Renato Brunner, Dornbirn (AT)
Assigned to MEDMIX SWITZERLAND AG, Haag (CH)
Filed by Sulzer Mixpac AG, Haag (CH)
Filed on Sep. 2, 2021, as Appl. No. 17/464,759.
Application 17/464,759 is a continuation in part of application No. 16/772,891, granted, now 11,154,887, previously published as PCT/EP2018/084967, filed on Dec. 14, 2018.
Claims priority of application No. 17209087 (EP), filed on Dec. 20, 2017; and application No. 18194346 (EP), filed on Sep. 13, 2018.
Prior Publication US 2021/0394227 A1, Dec. 23, 2021
Int. Cl. B05C 17/00 (2006.01); B05B 11/00 (2023.01); B05B 11/02 (2023.01); B05C 17/005 (2006.01); B29C 45/16 (2006.01); B29L 31/00 (2006.01)
CPC B05C 17/00579 (2013.01) [B05B 11/0039 (2018.08); B05B 11/0054 (2013.01); B05B 11/0078 (2013.01); B05B 11/02 (2013.01); B29C 45/1657 (2013.01); B29C 2045/1601 (2013.01); B29L 2031/7494 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A two-component piston for a cartridge, the two-component piston comprising:
a piston cover having a radially extending attachment portion, a rear side and a front side; and
a piston body including a front side and a rear side,
the rear side of the piston cover arranged adjacent to at least a part of the front side of the piston body and comprising a valve member configured and arranged to be received within the piston body and to extend into the piston body towards the rear side of the piston body, the piston cover configured to move relative to the piston body upon actuation of the valve member, and the piston cover being non-releasably connected to the piston body by a part of the piston body being overmolded to the radially extending portion of the attachment portion of the piston cover, the attachment portion extending longitudinally in a direction of the rear side of the piston body and the radially extending portion of the attachment portion extending in a substantially perpendicular direction to a longitudinal direction.