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Doylestown, PA, United States of America

Charles D Dern

Average Co-Inventor Count = 1.00

ph-index = 3

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 = 23

Charles D DernCharles D Dern (4 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Sp Industries, Inc. (4 from 14 patents)


4 patents:

1. 11181320 - Energy recovery in a freeze-drying system

2. 10976104 - Means and methods for selective shelf temperature control

3. 10782070 - Energy recovery in a freeze-drying system

4. 10113797 - Energy recovery in a freeze-drying system

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12/11/2025
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