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PCE
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DIFF Main Group
F28D 20/00

Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00

Introduced: January 1985

Title

Titles differ between systems:

IPC: Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups or

CPC: Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00

Full Title

Full titles differ between systems:

IPC:

Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups or

CPC:

Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00

CPC subdivides this area 8x more granularly than IPC with 7 additional codes.

7 codes are CPC-only extensions.

Note: 3 CPC extensions are marked as secondary classification only.

IPC defines codes here since 1995.

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