Average Co-Inventor Count = 1.33
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. Robbins & Myers, Inc. (1 from 15 patents)
2. Hydrochem Developments Ltd. (1 from 6 patents)
2 patents:
1. 5303933 - Shut-off seal for a rotatable shaft
2. 4878677 - Shut off seal about a shaft of a device having a side entry into a tank