Average Co-Inventor Count = 2.29
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. Spartan Tool, a Div. of Heico, Inc. (2 from 2 patents)
2. Spartan Tool Div. of Pettibone Corp. (1 from 7 patents)
3. Spartan Tool, LLC (1 from 5 patents)
4 patents:
1. 5309595 - Drain cleaning apparatus
2. 5239724 - Mechanism for advancing a rotating cylindrical member
3. 5222270 - Electromagnetic motor brake unit for rotary drain and sewer router
4. 5199129 - Torque monitoring system for rotary drain and sewer cleaning apparatus