Average Co-Inventor Count = 2.25
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. Otis Elevator Company (3 from 2,614 patents)
3 patents:
1. D317136 - Hall location direction panel for elevators
2. D317137 - Hall location direction panel for elevators
3. D315527 - Call button indicator for an elevator