Average Co-Inventor Count = 1.71
ph-index = 4
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. Kyowa Electric and Chemical Co., Ltd. (6 from 21 patents)
6 patents:
1. 6450401 - Writing board with electronic calculator
2. 6427928 - Straw with plug
3. 6416329 - Writing device for practice in writing characters
4. 6375019 - Straw with plug
5. 6315573 - Article placing table with an erasable writing device
6. 5214551 - Mechanism for positioning a magnetic head and a pinch roller in a tape