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40 Inventive Principles
Rejecting and Regenerating Parts

a) After it has completed its function or become useless, reject or modify (discard, dissolve, evaporate, etc.) an element of an object.

b) Immediately restore any part of an object which has become exhausted or depleted.
 

EXAMPLE:
  1. Instead of using sand to blast the surface of cavities, use the hard particles of frozen carbon dioxide (dry ice). After treatment, the particles evaporate without leaving any residue.
  2. The wings of hydrofoil boats erode due to the cavitation-effect of the water. As a counter measure, the wings are frozen which generates a thin, protective layer of ice that is constantly renewed.