Average Co-Inventor Count = 2.21
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. Silver Seiko Ltd. (7 from 54 patents)
7 patents:
1. D313239 - Typewriter
2. D299249 - Typewriter
3. D299248 - Typewriter
4. D291323 - Typewriter
5. D290616 - Typewriter
6. D282178 - Typewriter
7. D273117 - Typewriter for European languages