Patent ID: 9708576
Date: 2017-07-18
CPC Classifications: C12M

Claim:
1. A culture flask comprising: a culture chamber in a flask body having an even bottom wall with a growth surface on the top side, an even cover wall at a section from the bottom wall, and side walls that bridge the distance between the bottom wall and even cover wall; an opening in adjacent regions of a side wall and of the even cover wall at a distance from the bottom wall; a hollow cylindrical flask neck that is connected to the opening and is aligned at a sharp angle to the growth surface so that a serological pipette, a scraper, a cannula or another elongated device for adding or removing material can be placed on the rear corners of the growth surface from the outside through the flask neck; further comprising a flask base and a flask bonnet, wherein the flask base comprises the bottom wall, the side walls, and a first flask neck part connected to a side wall, the flask bonnet comprises the cover wall and a second flask neck part connected to the cover wall, and the flask base and the flask bonnet are connected to each other in a sealing manner at adjacent margins; wherein the first flask neck part is a hallow cylinder which, in a bottom margin section of an end face margin that runs in a surface perpendicular to the growth surface, is connected to the margin of a bottom opening section of the opening in the side wall, and wherein the second flask neck part is a hallow cylinder segment that is connected at an end face margin to a top margin section of the end face margin of the first flask neck part, and is connected at the two lateral margins to the margins of a top opening section of the opening in the cover wall that expands toward the first flask neck part; wherein the connection between the flask base and flask bonnet is an ultrasonic welded connection, and wherein the ultrasonic welded connection between the flask base and flask bonnet is created by welding an energy director that projects downward and runs around the margin of the flask bonnet into a groove that is open at the top and runs around the top margin of the flask base.