Growing community of inventors

Hillsborough, CA, United States of America

Duane A Spence

Average Co-Inventor Count = 2.00

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 = 6

Duane A Spence ↔ Rolf Woldseth (1 patent)Duane A SpenceDuane A Spence (1 patent)Rolf WoldsethRolf Woldseth (2 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Kevex Corporation (1 from 9 patents)


1 patent:

1. 4172225 - Alpha particle x-ray energy analysis system

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12/12/2025
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