what is the situation wrt. ideas created by employees while employed ? who owns them ?

[Peter]

The subject says it all. There are places where the employer owns everything.
What is the situation here ? I was unable to find a coherent answer, only
discussions so far. I.e. if A works for B and develops a product C independently
from his 'daytime' work, which he later markets with D or alone, can B claim
ownership ? 

thanks,

Peter


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