Average Co-Inventor Count = 1.75
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. Bell Telephone Laboratories (2 from 2,714 patents)
2. American Telephone and Telegraph, Co. (1 from 386 patents)
2 patents:
1. D295169 - Wall-mounted microphone
2. 4429190 - Continuous strip electret transducer array