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Patentable:
A new product or process, involving an inventive step and capable of being made or used in an industry. It means the invention to be patentable should be technical in nature and should meet the following criteria -
i) Novelty : The matter disclosed in the specification is not published in India or elsewhere before the date of filing of the patent application in India.
ii) Inventive Step: The invention is not obvious to a person skilled in the art in the light of the prior publication/knowledge/ document.
iii) Industrially applicable: Invention should possess utility, so that it can be made or used in an
industry.
Non-patentable:
The following are Non-Patentable inventions within the meaning of the Act: -
(a) an invention which is frivolous or which claims anything obviously contrary to well established natural laws;
(b) an invention the primary or intended use or commercial exploitation of which could be contrary to public order or morality or which causes serious prejudice to human, animal or plant life or health or to the environment;
(c) the mere discovery of a scientific principle or the formulation of an abstract theory (or discovery of any living thing or non-living substances occurring in nature);
(d) the mere discovery of a new form of a known substance which does not result in the enhancement of the known efficacy of that substance or the mere discovery of any new property or mere new use for a known substance or of the mere use of a known process, machine or apparatus unless such known process results in a new product or employs at least one new reactant ;
Explanation- For the purposes of this clause, salts, esters, ethers, polymorphs, metabolites, pure form, particle size, isomers, mixtures of isomers, complexes, combinations and other derivatives of known substance shall be considered to be the same substance, unless they differ significantly in properties with regard to efficacy.
(e) a substance obtained by a mere admixture resulting only in the aggregation of the properties of the components thereof or a process for producing such substance;
(f) the mere arrangement or re-arrangement or duplication of known devices each functioning independently of one another in a known way;
(g) a method of agriculture or horticulture;
(h) any process for the medicinal, surgical, curative, prophylactic,diagnostic, therapeutic or other treatment of human beings or any process for a similar treatment of animals to render them free of disease or to increase their economic value or that of their products.
(i) plants and animals in whole or any part thereof other than micro-organisms but including seeds, varieties and species and essentially biological processes for production or propagation of plants and animals;
(j) a mathematical or business method or a computer programme per se or algorithms;
(k) a literary, dramatic, musical or artistic work or any other aesthetic creation whatsoever including cinematographic works and television productions;
(I) a mere scheme or rule or method of performing mental act or method of playing game;
(m) a presentation of information; (n) topography of integrated circuits;
(o) an invention which in effect, is traditional knowledge or which is an aggregation or duplication
of known properties of traditionally known component or components.
(p) Inventions relating to atomic energy and the inventions prejudicial to the interest of security of
India.
Reference

For the people who need to understand or go through the Indian patent law. Here is the site where you can get the total information. The information is monitored and updated by Indian patent office.

Click here-Indian Patent Information