Growing community of inventors

Truckee, CA, United States of America

Matthew Stein

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 = 22

Matthew SteinMatthew Stein (4 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Duraflame, Inc. (2 from 12 patents)

2. Ningbo Yinzhou Bi Chun Water Purification Technology Limited Company (2 from 2 patents)


4 patents:

1. D884752 - Filter key device

2. D855668 - Filter key device

3. D424374 - Igniter

4. 6050811 - Igniter

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1/12/2026
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