Average Co-Inventor Count = 2.53
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. Vae Nortrak North America Inc. (8 from 11 patents)
2. Voestalpine Nortrak Inc. (3 from 6 patents)
3. Voestalpine Railway Systems Nortrak LLC (2 from 3 patents)
4. Voestalpine Vae Gmbh (1 from 10 patents)
5. Vae Nortak North America Inc. (1 from 1 patent)
14 patents:
1. 11168446 - Rail fastening apparatus
2. D910487 - Railroad tie
3. 10400397 - Boltless rail brace
4. 9352762 - Dual independent control hydraulic switch machine
5. 9290192 - Spring wing controller
6. 7677466 - Insulated rail joint assembly
7. 7185860 - Tongue switch
8. 7168664 - Assist rod and basket assembly
9. 6955326 - Tongue switch
10. 6758445 - Replaceable point frog
11. 6688560 - Assist rod and basket assembly
12. 6543727 - Assist rod and basket assembly
13. 6266866 - Frog insert and assembly and method for making frog assembly
14. 6158698 - Hollow tie switch assembly