We provides pct filing registration services in USA, California, Delware, New York, Canada, and India. A PCT patent filing is a way of applying for a patent in multiple countries at once. It is also known as an international patent application.We provides pct filing registration services in USA, California, Delware, New York, Canada, and India. A PCT patent filing is a way of applying for a patent in multiple countries at once. It is also known as an international patent application.