For the Inventor, By the Inventor

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Shelburne, VT, United States of America

Planetary Rotor Engine Company

USPTO Granted Patents = 2

EPO Patents = 1

Forward Citations = 27

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5 inventors (with patents filed for the assignee):

Ronald Joseph Fredricks (1 out of 1 patent)

Richard B Hathaway (1 out of 1 patent)

Alex R Hathaway Shields (1 out of 1 patent)

4. David A Sculthorpe (1 out of 1 patent)

5. William Bennett Ribbens (1 out of 17 patents)

2 patents: Sort by Forward Citations

1. 10145243 - Planetary rotary engine with rotary ring valves (2018-12-04),

2. 8356585 - Planetary rotary engine (2013-01-22),

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USPTO Data Jan 1 1976 - Oct 6 2026

2 Patents

#7 in Shelburne, VT

#173 in Vermont

#94,782 in US

Shelburne, VT, United States of America

Planetary Rotor Engine Company

Forward Citations = 27

5 inventors:

Ronald Joseph Fredricks (1 out of 1 patent)

Richard B Hathaway (1 out of 1 patent)

Alex R Hathaway Shields (1 out of 1 patent)

4. David A Sculthorpe (1 out of 1 patent)

5. William Bennett Ribbens (1 out of 17 patents)

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