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Insulated needle for forming an electrospray

  • US 5,223,226 A
  • Filed: 04/14/1992
  • Issued: 06/29/1993
  • Est. Priority Date: 04/14/1992
  • Status: Expired due to Term
First Claim
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1. A needle apparatus for converting a liquid into an electrospray comprising electrically charged liquid droplets, said needle apparatus having an entrance end and an exit end,means for introducing said liquid into said entrance end,an inner electrically conductive capillary in liquid communication with said entrance end having a liquid outlet,an outer electrically nonconductive tube surrounding said electrically conductive capillary and said liquid outlet of said electrically conductive capillary to electrically insulate said liquid outlet from atmosphere surrounding said needle apparatus.said nonconductive tube having an liquid outlet comprising said exit end andmeans for effecting an electrical potential on said electrically conductive capillary.

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