Patent Disclaimer Law and Legal Definition

Patent disclaimer means a disclaimer filed by a patent applicant, when his/her part of the invention is not patentable. It helps a patent applicant to relinquish part of the claim to the invention. Such a disclaimer can be filed to help to ensure the validity of the rest of the patent. A patent disclaimer, which makes definite and specific what was previously indefinite and general, is valid and proper, provided that such disclaimer abandons what was not originally needed and does not broaden or enlarge the original claim and leaves said claim supported by the original specification, and provided also that there is no fraud in connection with such disclaimer.