US Patent 11174669 Asymmetrical vacuum-insulated gazing unit

A vacuum insulating glazing unit includes a first glass pane having a thickness Z1, and a second glass pane made of prestressed glass having a thickness, Z2, where Z1 is greater than Z2 (Z1>Z2) The glazing unit also includes a set of discrete spacers positioned between the first and second glass panes and a hermetically bonding seal sealing the distance between the first and second glass panes over a perimeter. A vacuum of pressure less than 0.1 mbar is created in an internal volume V. A thickness ratio, Z1/Z2, of the thickness of the first glass pane, Z1, to the thickness of the second glass pane, Z2, is equal to or greater than 1.30 (Z1/Z2≥1.30).