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IPR-Helpdesk Bulletin
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  N. 35, September - October 2007 

IP in practice 
Patent of the month 
 

25th Compact Disc Anniversary

On 17th August 1982 the first Compact Disc was produced in Hanover (Germany) by Philips company. First records sold on CDs were The Visitors by Abba and the recording of Herbert von Karajan conducting the Alpine Symphony by Richard Strauss. This year we celebrate 25th anniversary of Compact Disc, a device which sparked a global revolution on the music market.

In most simple words the CD was jointly developed by Philips and Sony. In fact this story is much more complex and a contemporary CDs had many predecessors, including the American inventor James T. Russell. He was the first to develop a revolutionary idea to use light for sound recording and playing. He invented the first digital-to-optical recording and playback system and even obtained patent for it. His invention, the CD-ROM, found a few interested investors and licensees from audio companies, including Sony.



Copyright Philips

In 1979 Philips and Sony began their cooperation aimed at developing a new optical standard for music recordings. Both companies set up the standards for future CDs and agreed to share experiences from their achievements. As Piet Kramer, who was a member of the optical group at Philips, says: "We did this by collaborating openly to agree on a new standard. For Philips, this open innovation was a new approach and it paid off." For example Philips planed to produce 11.5cm diameter CD but changed plans when Sony insisted that a disc must hold all of Beethoven's 9th Symphony. The longest recording of that Symphony last 74 minutes and that is exactly the audio space on 12 cm CD.

The first CDs went on sale in November 1982. Classical music lovers were seen as the primary target because the first CD-players were very expensive, costing around 1000 £ at today’s rate. Since that time over 200 billion CDs have been sold. Compact Disc became the most popular carrier for music recording and computer digital data and was a predecessor of today’s DVDs. Philips Company was granted a series of patents for its complex invention.

25th CD Anniversary on Philips website

How the CD was developed

Story of James T. Russell, an early inventor of the technology

Compact Disk on Wikipedia

One of many Philips patents

Early James T. Russel Patent