Average Co-Inventor Count = 2.93
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 Aktiengesellschaft (1 from 18 patents)
2. Vae Nortrak North America Inc. (1 from 11 patents)
3. Voest-alpine Maschinenbau Gesellshaft M.b.h. (1 from 1 patent)
4. Voest-alpine Zeltweg Gesellschaft M.g.h. (1 from 1 patent)
4 patents:
1. 6371418 - Curve path of a switch, and track joint using this type of curve path
2. 5797565 - Railway diamond crossing
3. 5148980 - Device for securing in position guide rails
4. 4953814 - Railway switch comprising a frog having a movable main point and