4. Powder metallurgy processes
  5. Powder metallurgy processes with heating or sintering
  6. Making composite or hollow article

Keystone Investment Corporation

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High density dual helical gear

Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Reexamination Certificate

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High density ferrous power metal alloy

Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article
Patent

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Method for forming powder metal gears

Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Post sintering operation
Reexamination Certificate

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Method for producing powder metal gears

Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Controlled cooling after sintering
Reexamination Certificate

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Method for producing powder metal materials

Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
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