Statement as to working of Patent in India:

Patentee or his licensee in India is required to file a statement as to working of patent in India as to extent to which the invention has been commercially worked in India on FORM 27. Ordinarily the statement in respect of a calendar year (from January to December) has to be filed by next March 31 of calendar year. But, if the information is required by the Controller specifically it has to be supplied within 2 months of such requisition unless an extension has been sought as well as provided by the Controller.