Average Co-Inventor Count = 1.80
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. O&k Orenstein & Koppel Aktiengesellschaft (1 from 110 patents)
2. O & K Rolltreppen Gmbh & Co. Kg (1 from 7 patents)
3. Ketten Wulf Gmbh Gelenkketten- Und Kettenraderfabrik of Eslohe-kuckelheim (1 from 1 patent)
4. O&k Rolltreppen Gmbh of Hattingen (1 from 1 patent)
3 patents:
1. 6129442 - Lighting device for systems used for conveying people
2. 5785166 - Drive system for escalators or moving sidewalks
3. 5379877 - Handrail drive for escalators, moving sidewalks or the like