Vented beverage can end having an anti-tension score

A beverage can end for seaming onto a can body, the can end comprising:

• a peripheral wall;
• a center panel;
• a tab attached to the center panel by a rivet;
• characterized by:
• a tear panel including (i) a main portion capable of pivoting about a hinge and (ii) a vent portion;
• a main reference line that bisects the tear panel main portion and extends through the rivet, the hinge being offset relative to the main reference line;
• a transverse reference line that is perpendicular to the main reference line and extends through the rivet, the main portion of the tear panel being located in front of the transverse reference line;
• a primary score including an arcuate main score that defines the main portion of the tear panel and a main score extension that defines the vent portion,
• a first end of the main score (i) defines one end of the hinge and (ii) is located on the hinge-side of the main reference line and in front of the transverse reference line (Q1),
• an intermediate point between the main score and the main score extension, the intermediate point is located on the hinge-side of the main reference line and either in front of the transverse reference line (Q1) or behind the transverse reference line (Q3),
• the main score extension extending from the intermediate point to an end of the main score extension that is located on the hinge-side of the main reference line and to the rear of the transverse reference line (Q3);
• and
• an anti-tension score that follows the main score extension;
• whereby the score is configured such that lifting the tab from its horizontal rest position to an intermediate position ruptures the main score portion to pivot the tear panel main portion about the hinge and either a second lifting operation or a twisting operation ruptures the main score extension.