Average Co-Inventor Count = 2.67
ph-index = 2
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. Learning Resources, Inc. (1 from 23 patents)
2. Educational Insights, Inc. (1 from 19 patents)
2 patents:
1. 8611192 - Elapsed time clock
2. D642078 - Elapsed time clock