The Patents Act,1970
Section 68. Assignments, etc. not to be valid unless in writing and duly executed
1[Assignments, etc. not to be valid unless in writing and duly executed.An assignment of a patent or of a share in a patent, a mortage, 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.]
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1. Substituted by the Patents (Amdt.) Act,2005, w.e.f. 1-1-2005.