Average Co-Inventor Count = 1.50
ph-index = 2
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. Massey-ferguson-perkins Limited (1 from 6 patents)
2. Perkins Engine Group Limited (1 from 1 patent)
2 patents:
1. 4502452 - Valve
2. 4479463 - Engine sump