Criticism arises over a  patent  for causing apparent hindrance to existing invention. A firm that wants to make some changes to its existing invention finds itself in a helpless situation. Since it so happens that the patent draws guidelines and limits any firm going for it owing it to exploitation as a reason. The firm has got a genuine correction to do to its existing one and does not get a go-ahead. Limitations like these can only hamper things and pave a way for someone who waits to exploit a good invention. The patent here does not actually help the cause of improvisation in the technical aspects of an invention.