Can someone explain about Patent Cooperation Treaty ?

Answer 1

The Patent Cooperation Treaty (PCT) provides a unified procedure for filing patent applications to protect inventions internationally. A single filing results in a single search accompanied with a written opinion (and optionally a preliminary examination), after which the examination (if provided by national law) and grant procedures are handled by the relevant national or regional authorities. The PCT does not lead to the grant of an "international patent", which does not exist.

The States party to the PCT constitute the International Patent Cooperation Union. As of July 31, 2006, there were 133 Contracting States to the PCT. The PCT will enter into force for Malaysia, the 131st Contracting State, on August 16, 2006, for El Salvador, the 132nd Contracting State, on August 17, 2006, and for Guatemala, the 133rd Contracting State, on October 14, 2006.


History
The Washington Diplomatic Conference on the Patent Cooperation Treaty took place from May 25 to June 19, 1970. The Patent Cooperation Treaty was signed in Washington at the very end of the conference, i.e., on June 19, 1970. The Treaty entered into force on January 21, 1978 initially with 18 Contracting States. The first international applications were filed on June 1 1978. The Treaty was subsequently amended in 1979, and modified in 1984 and 2001.

Answer 2

The Patent Cooperation Treaty (PCT) provides a unified procedure for filing patent applications to protect inventions internationally. A single filing results in a single search accompanied with a written opinion (and optionally a preliminary examination), after which the examination (if provided by national law) and grant procedures are handled by the relevant national or regional authorities. The PCT does not lead to the grant of an "international patent", which does not exist.

Answer 3

Sweety, I can't explain something I don't understand. Look it up on the internet.