Average Co-Inventor Count = 3.00
ph-index = 5
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. Meisei Electric Co., Ltd. (5 from 22 patents)
5 patents:
1. D310076 - Telephone
2. D304564 - Attendant telephone switchboard
3. D303801 - Direct station telephone selector
4. D300029 - Direct station telephone selector stand
5. D299134 - Telephone apparatus with speakerphone and display panel