Average Co-Inventor Count = 6.18
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. Royal Appliance Mfg., Co. (3 from 234 patents)
3 patents:
1. D405929 - Vacuum cleaner
2. D359604 - Vacuum cleaner
3. D358236 - Vacuum cleaner