Average Co-Inventor Count = 3.90
ph-index = 4
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. Allegheny International Exercise Co. (4 from 8 patents)
2. True Temper Railway Appliances, Inc. (1 from 5 patents)
5 patents:
1. D290282 - Exercise cycle
2. D289670 - Exercise cycle
3. D289669 - Exercise cycle
4. D280226 - Exercise cycle
5. 4354634 - Rail overturn prevention device