Growing community of inventors

Roseville, CA, United States of America

Joseph R Perkins

Average Co-Inventor Count = 1.20

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.

Forward Citations = 48

Joseph R PerkinsSylvester L Woodland (1 patent)Joseph R PerkinsJoseph R Perkins (3 patents)Sylvester L WoodlandSylvester L Woodland (1 patent)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. C & K Systems, Inc. (2 from 31 patents)

2. Sortex North America, Inc. (1 from 4 patents)


3 patents:

1. D328875 - Infrared detector mirror

2. 5089704 - Wide angle ceiling mounted passive infrared intrusion detection system

3. 4314645 - Mechanical rejection system for automatic sorting machines

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12/4/2025
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