Average Co-Inventor Count = 1.34
ph-index = 4
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. Koh-i-noor Rapidograph, Inc. (5 from 52 patents)
2. Rotring International Gmbh & Co. Kg (1 from 8 patents)
6 patents:
1. D357276 - Ink stylus pen
2. 4729685 - Writing instrument with press mechanism and magnetic catch
3. 4669617 - Pen holder device
4. D287603 - Writing pen
5. D284582 - Fountain pen for artists and calligraphers or the like
6. 4573503 - Ink dropper closure