Second window may refer to: broadcast syndication rights for a work following the expiration of first window rights for that work the inter-partes review period for third-party challenge and opposition of a granted patent or trademark a wavelength band or transmission window in fibre-optic communications the period of ischemic preconditioning, starting 24 hours after a coronary occlusion and lasting up to 72 hours, that can limit injuries of a subsequent ischaemia reperfusion in the myocardium See also Second Window, Second Floor, a song by Clyde McPhatter First window (disambiguation) Window (disambiguation) Windowing (disambiguation) Windows (disambiguation)