Average Co-Inventor Count = 2.77
ph-index = 2
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. Other (1 from 832,718 patents)
2. At&t Bell Laboratories (1 from 3,345 patents)
3. At&t Information Systems Inc. (1 from 243 patents)
4. Teletype Corporation (1 from 132 patents)
3 patents:
1. 5033083 - Telephone line switch apparatus
2. 4859820 - Quiet key switch
3. D278239 - Stand-alone keyboard