Average Co-Inventor Count = 1.33
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. Donaldson Comapny, Inc. (1 from 1,404 patents)
2. Rollerblade, Inc. (1 from 71 patents)
3. Nortronics Company, Inc. (1 from 10 patents)
4. Wright Products Corp. (1 from 7 patents)
4 patents:
1. D324713 - Long blade roller skate
2. D297911 - Combined door knob and escutcheon
3. D261888 - Cassette tape eraser
4. D247161 - Sound level meter