I agree with seattlejohn, the contract does not go far enough (in your favor). If this is contract work, I would want the specific technologies you were working on specified in the contract and say that the company would only get discoveries you make based in those technologies.

You also have to be careful about future developments. It is not unknown for people to find themselves unable to do technical work for years after they do a certain job because of restrictions in the kind of work they can do after working with "private technology". Ensure that if you cannot find a job because you are not allowed to go and work for a competitor after you leave your employment with company X that they will continue to pay you your salary or release you from the terms of the contract.

Good luck and please don't get your career ruined by signing an overgeneral contract.