Patent information is useful to a wide spectrum of users. Chemical patent information is particularly useful to those concerned with innovations in this area, as the chemical patent literature is almost of the same size as the chemical journal literature. National and International patent laws and treaties greatly influence the size of patent literature, its dissemination and exploitation for economic development. Paris Convention, WIPO and PCT programmes have all played an important role in the field of patent information. In India, patent information has a very significant role to play because the country's present law offers wide-ranging opportunities from adaptive development on a foreign patent to its commercialization. Patent information services in India are provided by several organisations which include the Patent Office Headquarters at Calcutta and its branches at New Delhi, Bombay and Madras; Patent Information System, Nagpur; National Informatics Centre, New Delhi; Patent Unit, Council of Scientific and Industrial Research, New Delhi; Technical Information Cell, Bharat Heavy Electricals Limited, Hyderabad; National Chemical Laboratory, Pune and National Information Centre for Drugs and Pharmaceuticals, Lucknow. Many of these organisations cover all areas of technology whereas others are restricted to particular disciplines. National Information Centre for Drugs and Pharmaceuticals is one such specialised centre restricted to only drugs and pharmaceutical. Its services such as patent bulletin and patent searches on selected drugs have been well accepted by the users. The Centre's holdings of foreign patent literature are meagre and need to be strengthened by acquiring them mainly from the U.S.A., France, F.R.G., Japan, Italy and Switzerland which are the top six nations responsible for introducing new drug substances. With a computer now installed at the Centre, the Centre should acquire INPADOC database and collaborate with existing Patent Information System, Nagpur and National Informatics Centre, New Delhi for better services. A survey of the patent information services in the countries of Asia and the Pacific carried out by the International Bureau of WIPO has put India in the first category because here information services are rendered by both the Industrial property organisation and other outside agencies.