1. National Research Development Corporation (NRDC)
http://www.nrdcindia.com
Offers on-line patent search services.
2. Patent Café Magazine
http://www.ipsearchengine.com/index.asp?id=9
Exhaustive source of data on intellectual property, also offers patent search facility.
3. Delphion
http://www.delphion.com/research/
Exhaustive source of data on intellectual property, also offers patent search facility.
4. Patent Facilitating Centre
http://www.indianpatents.org.in/
Offers patent search facilities, Indian, US, European.
5. NIC
http://pk2id.delhi.nic.in/
NIC offers both on-line and off-line patent search services.
6. URDIP
http://www.urdip.res.in
Unit for Research and Development of Information Products (URDIP) is the source for large number of Databases, like CSIR patents, CSIR rural technologies, medicinal plants etc, with a search engine.
7.Freepatentsonline
http://www.freepatentsonline.com/
Online site for free patent searching.
8.Bigpatents India
http://india.bigpatents.org/
See abstract of patents filed in India.
9.Patentgenius
http://www.patentgenius.com/
Patent Genius has full text patent descriptions, lists of patents by inventor and companies that hold patents, the ability to view all patents in any class or category, and much more.
10.FreshPatents.com
http://www.freshpatents.com/
FreshPatents.com features the latest published US patent applications.
11.Google patent search
http://www.google.com/patents
Easy to search , contains over  7 million patents.
12.iRunway
http://www.i-runway.com/index.html
iRunway is a leading provider of technology due diligence, innovation management, intellectual property and litigation support service to corporations and law firms worldwide. Based in Bangalore.
13. NIIPM
http://www.ipindia.nic.in/
The National Institute of Intellectual Property Management (NIIPM) is a Central Government Organization under the Ministry of Commerce & Industry engaged in conducting various Intellectual Property (IPR) training programs on Patents, Designs, Trademarks and Geographical Indications.

14. TMPsearchers
 http://www.tmpsearchers.com
Apart from free patent search of Indian patents, TMPsearchers, a Patent and Trademark Services website, also offers a Free Patent Training Course online to all registered members. The course lessons are sent by email one per day for 125 days.
15. Meta Yage (Arjun Bala)
http://www.metayage.com/
Patent Agent with varied experience in US Patent Prosecution, India Patent Prosecution, Patent Portfolio Analysis, Invention Disclosure mining, IP Strategy consulting. Interested in Consulting with Technology companies on IP issues.
16. Joydip Chakladar, consultant-Business planning
joydip.chakladar@gmail.com