Average Co-Inventor Count = 4.80
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. Elk Corporation of Dallas (3 from 18 patents)
2. Elk Premium Building Products, Inc. (1 from 25 patents)
4 patents:
1. 6530189 - Aesthetic, self-aligning shingle for hip, ridge, or rake portion of a roof
2. 6418692 - Aesthetic, self-aligning shingle for hip, ridge, or rake portion of a roof
3. 6289648 - Laminated roofing shingle
4. 6199338 - Universal starter shingle