4. Metal working
  5. Method of mechanical manufacture
  6. Electrical device making

R. H. Johnson

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Active counterbalance for a power swivel during well drilling

Boring or penetrating the earth – With means to simultaneously feed and rotate tool from a...
Patent

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Alkaline leaching of galvanized steel scrap

Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent

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Aluminized steel alloys containing chromium

Stock material or miscellaneous articles – All metal or with adjacent metals – Having composition – density – or hardness gradient
Patent

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Apparatus for feeding grinding balls

Solid material comminution or disintegration – Apparatus – With automatic control
Patent

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Apparatus for meniscus coating a steel strip

Coating apparatus – With heat exchange – drying – or non-coating gas or vapor... – To remove or spread applied coating by gas blast
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Profile ID: LFUS-PAI-P-68949

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