Average Co-Inventor Count = 2.00
ph-index = 1
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. Gaf Corporation (2 from 498 patents)
2 patents:
1. 4041815 - Method for perforating roofing sheet material
2. 3983773 - Apparatus for perforating roofing sheet material