Average Co-Inventor Count = 3.27
ph-index = 3
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. Bally Manufacturing Corporation (2 from 93 patents)
2. Midway Mfg. Co. (1 from 3 patents)
3 patents:
1. 4429876 - Pinball machine and play feature thereof
2. 4424970 - Panic post for pinball games
3. 4176844 - Multi-station pinball game