Growing community of inventors

Sammamish, WA, United States of America

D Drake Callahan

Average Co-Inventor Count = 4.00

ph-index = 1

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.

Forward Citations = 1

D Drake CallahanAmy Y Huang (3 patents)D Drake CallahanCatherine Needham (3 patents)D Drake CallahanDouglas P Britsch (3 patents)D Drake CallahanD Drake Callahan (3 patents)Amy Y HuangAmy Y Huang (5 patents)Catherine NeedhamCatherine Needham (3 patents)Douglas P BritschDouglas P Britsch (3 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Apollo Group, Inc. (2 from 4 patents)

2. Apollo Education Group, Inc. (1 from 30 patents)


3 patents:

1. 9286645 - Academic activity stream

2. 8402020 - Academic activity stream

3. 8341148 - Academic activity stream

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idiyas.com
as of
12/10/2025
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