Average Co-Inventor Count = 1.76
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. Packaging Corporation of America (1 from 140 patents)
2. Guardian Packaging Corporation (1 from 3 patents)
3. Belford Patrick, Inc. (1 from 1 patent)
3 patents:
1. 5507406 - Tamperproof/tamper evident container
2. 4974738 - Container with interchangeable components
3. D263682 - Jelly cup tray