Average Co-Inventor Count = 1.92
ph-index = 3
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. Hitachi, Ltd. (4 from 42,485 patents)
2. Hitachi Cable, Inc. (1 from 836 patents)
3. Hitachi Elevator Engineering Co., Ltd. (1 from 3 patents)
4 patents:
1. 5160009 - Passenger conveyor and moving handrail for passenger conveyor and
2. 4958473 - Frame, angle member for use in the frame and method of making joint
3. 4820245 - Power transmitting apparatus having chain retaining member
4. 4811829 - Frame of passenger conveyor