Average Co-Inventor Count = 1.33
ph-index = 1
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. Ta Triumph-adler Aktiengesellschaft (1 from 35 patents)
2. Grundig E.m.v. Elektro-mechanische Versuchsanstalt, Max Grundig Holland, (1 from 5 patents)
2 patents:
1. 4810116 - Ribbon cassette
2. 4630141 - Tape cassette non-erase mechanism