Average Co-Inventor Count = 1.33
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. Werner Co. (2 from 219 patents)
2. R. D. Werner Co., Inc. (2 from 21 patents)
4 patents:
1. 5533591 - Ladder rail cap
2. 5370203 - Ladder shoe spur plate
3. 5154255 - Ladder shoe and method of use
4. 5020757 - Ladder jack clamping devices