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Acton, MA, United States of America

John R Hagerstrom

Average Co-Inventor Count = 3.00

ph-index = 2

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 = 27

John R HagerstromDonald J Lennon (2 patents)John R HagerstromC Frederick Ekman (2 patents)John R HagerstromJohn R Hagerstrom (2 patents)Donald J LennonDonald J Lennon (9 patents)C Frederick EkmanC Frederick Ekman (2 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Epp, Inc. (2 from 8 patents)


2 patents:

1. 4296176 - Inks for pulsed electrical printing

2. 4273847 - Inks for pulsed electrical printing and methods of producing same

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as of
12/19/2025
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