U.S. patents available from 1976 to present.
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Low cost electroless plating process for single chips and wafer parts and products obtained thereof

Patent 6548327 Issued on April 15, 2003. Estimated Expiration Date: Icon_subject April 24, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

Multi chip module with conductive adhesive layer
Patent #: 6002180
Issued on: 12/14/1999
Inventor: Akram, et al.

Method of making components with solder balls
Patent #: 6165885
Issued on: 12/26/2000
Inventor: Gaynes, et al.

Bumpless flip chip assembly with solder via
Patent #: 6319751
Issued on: 11/20/2001
Inventor: Lin

Semiconductor device and method of fabricating the same Patent #: 6329228
Issued on: 12/11/2001
Inventor: Terashima

Inventors

Assignee

Application

No. 841359 filed on 04/24/2001

US Classes:

438/118, Including adhesive bonding step257/E21.174, From a liquid, e.g., electrolytic deposition (EPO)257/E21.508Forming solder bumps (EPO)

Examiners

Primary: Nelms, David C.
Assistant: Le, Thao P.

Attorney, Agent or Firm

International Class

H01L 021/44

Abstract

The present invention is related to a method for electroless plating Nickel/Gold on aluminium bonding pads of single chips or wafer parts. This method result in uniformly plated singulated chips, single dice or wafer parts in a much more simple and cost-effective way. The proposed method comprises the steps of attaching to die or wafer part to a non-conductive adhesive or substrate.

Other References

  • Strandjord et al., "Low Cost Wafer Bumping Processes for Flip Chip Applications (Electroless Nickel-Gold/Stencil Printing)," IMAPS '99, Chicago, www.icinterconnect.com/imaps99.htm
  • S. Jittinorasett et al., "UBM Formation on Single Die/Dice for Flip Chip Applications," 1999 International Symposium on Microelectronics sponsored by International Microelectronics And Packaging Society, Oct. 26-28, 1999, pp. 39-4
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