Average Co-Inventor Count = 4.00
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. Elk Premium Building Products, Inc. (2 from 25 patents)
2. Elkcorp (1 from 14 patents)
3. Building Materials Investment Corporation (284 patents)
3 patents:
1. 6990779 - Roofing system and roofing shingles
2. 6936329 - Fastener-free composite roofing product
3. 6708456 - Roofing composite