First window

First window may refer to:

  • first broadcast syndication rights for a work
  • the post-grant review period for third-party challenge and opposition of a pending patent or trademark
  • a wavelength band or transmission window in fibre-optic communications
  • the initial 4-6 hour period of ischemic preconditioning, known as classical or early preconditioning, in which a coronary occlusion can limit injuries of a subsequent ischaemia reperfusion in the myocardium

See also

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