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. Pentel Kabushiki Kaisha (3 from 264 patents)
3 patents:
1. 4626120 - Resilient writing nib with offset flattened portion
2. 4525092 - Tubular writing tip having an outer reduced diameter portion
3. 4364684 - Writing instrument