For the Inventor, By the Inventor

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Portland, OR, United States of America

Northwest Natural Gas Company

USPTO Granted Patents = 3

Trademarks = 12

Forward Citations = 43

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7 inventors (with patents filed for the assignee):

Seyfettin Can Gulen (2 out of 3 patents)

Sarah Sue Adams (2 out of 2 patents)

Roger Martin Haley (2 out of 2 patents)

4. J Keith White (2 out of 2 patents)

5. David Allen Weber (1 out of 1 patent)

6. David Alan Weber (1 out of 1 patent)

7. Aarne T Haas (1 out of 1 patent)

3 patents: Sort by Forward Citations

1. 10465851 - System for compressed gas energy storage (2019-11-05),

2. 9803803 - System for compressed gas energy storage (2017-10-31),

3. 4530247 - Timed gas metering and distribution system (1985-07-23),

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USPTO Data Jan 1 1976 - Dec 16 2025

3 Patents

#267 in Portland, OR

#825 in Oregon

#71,953 in US

Portland, OR, United States of America

Northwest Natural Gas Company

Forward Citations = 43

7 inventors:

Seyfettin Can Gulen (2 out of 3 patents)

Sarah Sue Adams (2 out of 2 patents)

Roger Martin Haley (2 out of 2 patents)

4. J Keith White (2 out of 2 patents)

5. David Allen Weber (1 out of 1 patent)

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