Average Co-Inventor Count = 6.68
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. Siemens Rolm Communications Inc. (3 from 13 patents)
2. Siemens Business Communication Systems, Inc. (2 from 46 patents)
3. Ameritech Corporation (1 from 159 patents)
4. Siemens Information and Communication Products LLC (1 from 3 patents)
5. Siemens Business Communications Systems (1 from 2 patents)
6. Siemens Palm Communication Inc. (1 from 1 patent)
8 patents:
1. D428868 - Cordless telephone
2. D392284 - Telephone
3. D389142 - Telephone
4. D387063 - Telephone key expansion unit
5. D386759 - Telephone
6. D375095 - Telephone
7. D374667 - Telephone
8. D374674 - Telephone key expansion unit