Average Co-Inventor Count = 6.00
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 Corporation of Dallas (2 from 18 patents)
2. Elk Premium Building Products, Inc. (1 from 25 patents)
3 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