For the Inventor, By the Inventor

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Stone International Limited

USPTO Granted Patents = 3

Trademarks = 2

Forward Citations = 19

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4 inventors (with patents filed for the assignee):

Paul Francis Zwaan (1 out of 8 patents)

Richard Burrows (1 out of 1 patent)

Michael J Virr (1 out of 1 patent)

4. Derek Thompson-Ashworth (1 out of 1 patent)

3 patents: Sort by Forward Citations

1. D513808 - Facade for a building element (2006-01-24),

2. 4754997 - Glider doors (1988-07-05),

3. 4528945 - Boiler and method of heating liquid (1985-07-16),

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USPTO Data Jan 1 1976 - Jan 6 2026

3 Patents

#512 in

#4,798 in United Kingdom

Stone International Limited

Forward Citations = 19

4 inventors:

Paul Francis Zwaan (1 out of 8 patents)

Richard Burrows (1 out of 1 patent)

Michael J Virr (1 out of 1 patent)

4. Derek Thompson-Ashworth (1 out of 1 patent)

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