Section 68 of the Indian Patents Act
Section 68 of the Indian Patents Act 1970 is about Assignments, etc., not to be valid unless in writing and duly executed. It is under CHAPTER XIII of the Act. CHAPTER XIII is titled REGISTER OF PATENTS.
An assignment of a patent or of a share in a patent, a mortgage, licence or the creation of any other interest in a patent shall not be valid unless the same were in writing and the agreement between the parties concerned is reduced to the form of a document embodying all the terms and conditions governing their rights and obligations and duly executed.]
Section 67 Indian Patents Act 1970 (Register of patents and particulars to be entered therein.)