Average Co-Inventor Count = 2.00
ph-index = 2
The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.
Company Filing History:
1. U.S. Philips Corporation (4 from 14,087 patents)
2. Polygram International Holding (1 from 1 patent)
4 patents:
1. 5901006 - Apparatus for recording information signals on a record carrier
2. 5444675 - Cassette adapter for a playback deck of the front-loading or the
3. 5371634 - Arrangement for obtaining prerecorded digital music cassettes
4. 5243470 - Arrangement for obtaining prerecorded digital music cassettes