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Plymouth, MN, United States of America

Cal Krupa

Average Co-Inventor Count = 1.00

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 = 77

Cal KrupaCal Krupa (2 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Ultra Pac, Inc. (2 from 42 patents)


2 patents:

1. D329198 - Container with hinged lid

2. D328705 - Container with hinged lid

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as of
12/13/2025
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