4. Heat exchange
  5. Non-communicating coaxial enclosures
  6. Helical conduit means

L. Robert Zifferer

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Apparatus and methods for forming internally and externally...

Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Reexamination Certificate

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Apparatus and methods for forming internally and externally...

Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Reexamination Certificate

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Corrugated heat exchanger element having grooved inner and...

Heat exchange – With coated – roughened or polished surface
Reexamination Certificate

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Heat exchange element

Heat exchange – Non-communicating coaxial enclosures – Helical conduit means
Patent

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Heat exchange element

Heat exchange – Non-communicating coaxial enclosures – Helical conduit means
Patent

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Profile ID: LFUS-PAI-P-1542604

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