Average Co-Inventor Count = 1.00
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. Tonka Corporation (2 from 47 patents)
2 patents:
1. 4422263 - Gear changing mechanism for toy vehicle driving devices
2. 4363185 - Vehicle with gear-changing mechanism including two displaceable gears