Average Co-Inventor Count = 3.60
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. Mitsumi Electric Company Ltd. (3 from 1,572 patents)
2. Sony Corporation (1 from 58,131 patents)
3. Pioneer Electronic Corporation (1 from 2,861 patents)
4. Sony Kabushiki Kaisha (1 from 27 patents)
3 patents:
1. 5901015 - Magnetic head apparatus having a reduced thickness
2. D398613 - Magnetic head
3. 5383076 - Magnetic head device with cleaning means for cleaning sliding surface