Explain the provisions of 'Revocation of Patents by Controller for Non-working' as per Section 85 of the Patent Act, 1970 ?

Section 85 of the Patents Act, 1970 deals with revocation of patents by Controller for non-working and provides that where, in respect of a patent, a compulsory licence has been granted, the Central Government or any person interested may, after the expiration of two years from the date of the order granting the first compulsory licence, apply to the Controller for an order revoking the patent on the ground that the patented invention has not been worked in the territory of India or reasonable requirements of the public with respect to the patented invention has not been satisfied or the patented invention is not available to the public at a reasonably affordable price. Every application for revocation should contain prescribed particulars, the facts upon which the application is based, and, in the case of an application other than by the Central Government, should also set out the nature of the applicant's interest. The Controller, if satisfied that the reasonable requirements of the public with respect to the patented invention has not been satisfied or patented invention has not been worked in the territory of India or is not available to the public at a reasonably affordable price, may make an order revoking the patent. The controller has however been put under obligation to ordinarily decide such application within one year of its presentation.