Incandescent light bulb street in the world to be lit by an incandescent lightbulb was Mosley Street, Newcastle upon Tyne, United Kingdom. It was lit by Joseph Swan's incandescent lamp on 3 February 1879. Thomas Edison began serious research into developing a practical incandescent lamp in 1878. Edison filed his first patent application for "Improvement In Electric Lights" on 14 October 1878. After many experiments, first with carbon in the early 1880s and then with platinum and other metals, in the end Edison returned to a carbon filament. The first successful test was on 22 October 1879, and lasted 13.5 hours. Edison continued
Representation before the European Patent Office point when candidates failed to select the "right" starting document (for assessing the inventive step of some claims) and the blanket addition of 10 points to the grade of all C papers, was strongly criticized. As of November 2010, there were a little more than 10,000 persons on the list of professional representatives, "just less than 1500" "legal practitioners entitled to represent before the EPO", and "about 300 patent law firms, which are registered as „associations of representatives“ within the meaning of ". As of January 2013, there were precisely 10,427 professional representatives. Under , an association of professional representatives