sorry, there is something wrong with my computer so that I cannot use Chinese typing.
first of all, thank you all for participating in the discussion.
there was no definition of element C in the above claim of the original application documents, but it was added later according to the examiner\'s oppinion so as to define the position with element C.
the matter intresting for me is how to judge the essential technical features in the case. what roles may the definition of use of an product in a claim play when judging the essential technical features.
Thank you.