Growing community of inventors

Lakeville, MN, United States of America

Donald B Ketcham

Average Co-Inventor Count = 3.00

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 = 5

Donald B Ketcham ↔ Dong-Wei Zhu (38 patents)Donald B Ketcham ↔ Jingjing Ma (24 patents)Donald B Ketcham ↔ Michael L Tumey (12 patents)Donald B Ketcham ↔ Robert P McCollam (1 patent)Donald B Ketcham ↔ Kent R Kalar (1 patent)Donald B Ketcham ↔ Peter J Elliott (0 patent)Donald B KetchamDonald B Ketcham (1 patent)Dong-Wei ZhuDong-Wei Zhu (38 patents)Jingjing MaJingjing Ma (24 patents)Michael L TumeyMichael L Tumey (12 patents)Robert P McCollamRobert P McCollam (6 patents)Kent R KalarKent R Kalar (1 patent)Peter J ElliottPeter J Elliott (0 patent)
..
Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Minnesota Mining and Manufacturing Company (1 from 7,865 patents)

2. 3m Innovative Properties Company (14,076 patents)


1 patent:

1. 5420742 - Degausser for tape with plural recorded segments

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as of
12/26/2025
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