Average Co-Inventor Count = 2.45
ph-index = 7
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. (9 from 22 patents)
9 patents:
1. D323827 - Telephone set
2. D320797 - Telephone instrument set
3. D315564 - Direct station telephone selector
4. D313235 - Telephone apparatus
5. D310076 - Telephone
6. D304564 - Attendant telephone switchboard
7. D303801 - Direct station telephone selector
8. D300029 - Direct station telephone selector stand
9. D299134 - Telephone apparatus with speakerphone and display panel