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Method and apparatus for indelibly marking articles during a manufacturing process

  • US 4,255,851 A
  • Filed: 12/06/1978
  • Issued: 03/17/1981
  • Est. Priority Date: 12/06/1978
  • Status: Expired due to Term
First Claim
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1. A method of indicating a defective site in a lead frame assembly having a plurality of components bonded thereto comprising the steps of:

  • (a) positioning a portion of the lead frame assembly which will be discarded in a later manufacturing process and which is in the region of the defective component into a spaced relationship with a charged spark electrode; and

    (b) producing a spark between said electrode and the lead frame assembly for marking said portion of the lead frame.

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