Growing community of inventors

Portland, TN, United States of America

Darrin Johnson

Average Co-Inventor Count = 2.00

ph-index = 5

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 = 87

Darrin JohnsonRichard P Laitta (10 patents)Darrin JohnsonDarrin Johnson (10 patents)Richard P LaittaRichard P Laitta (12 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. S.r. Smith, LLC (10 from 32 patents)


10 patents:

1. RE47795 - Handrail

2. RE47549 - Handrail

3. RE47041 - Handrail

4. RE46894 - Handrail

5. RE46895 - Handrail

6. D706448 - Handrail

7. D706449 - Handrail

8. D706451 - Handrail

9. D706450 - Handrail

10. D706452 - Stair rail

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as of
1/12/2026
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