4. Powder metallurgy processes
  5. Powder metallurgy processes with heating or sintering
  6. Consolidation of powder prior to sintering

Helio Precision Products, Inc.

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Heat treated valve guide and method of making

Metal treatment – Stock – Ferrous
Reexamination Certificate

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Method of making valve guide by powder metallurgy process

Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Consolidation of powder prior to sintering
Reexamination Certificate

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Method of making valve guide having textured external surface

Abrading – Abrading process – With tool treating or forming
Reexamination Certificate

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