For the Inventor, By the Inventor

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Stoke-on-Trent, United Kingdom

Simon-hartley Limited

USPTO Granted Patents = 20

Trademarks = 2

Forward Citations = 326

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17 inventors (with patents filed for the assignee):

Eric P Austin (11 out of 11 patents)

Paul J Lewis (4 out of 4 patents)

Anthony Pinches (4 out of 4 patents)

4. Geoffrey M Black (4 out of 4 patents)

5. Bernard Atkinson (4 out of 4 patents)

6. Frederick B Gardner (3 out of 3 patents)

7. Robert W Harper (2 out of 2 patents)

8. Charles E Tharp (1 out of 35 patents)

9. Michael J Gribbin (1 out of 2 patents)

10. John Trevor Allanson (1 out of 1 patent)

11. David C Niblett (1 out of 1 patent)

12. James T Capewell (1 out of 1 patent)

13. Kenneth Herman Toft (1 out of 1 patent)

14. William S Robertson (1 out of 1 patent)

15. Howard J Worrall (1 out of 1 patent)

20 patents: Sort by Forward Citations

1. 5135651 - Sludge dewatering system (1992-08-04),

2. 5129195 - Sluice gate or penstock door (1992-07-14),

3. 5129147 - Sluice gate or penstock door (1992-07-14),

4. 5117871 - Flap valve (1992-06-02),

5. 5103864 - Liquid distribution systems (1992-04-14),

6. 5059322 - Apparatus for dewatering sludge (1991-10-22),

7. 4839053 - Biomass growth process with separate aeration and media compartments (1989-06-13),

8. 4738432 - Fluid flow control valves (1988-04-19),

9. 4582600 - Growth of biomass (1986-04-15),

10. 4545909 - Growth of biomass (1985-10-08),

11. 4498985 - Growth of biomass (1985-02-12),

12. 4419243 - Growth of biomass (1983-12-06),

13. 4404099 - Sludge thickening (1983-09-13),

14. 4354935 - Apparatus for thickening sludge (1982-10-19),

15. 4151231 - Rotary surface aerators (1979-04-24),

Simon-hartley Limited is a global consultancy specializing in organizational dynamics and culture change. With over 25 years of experience, we help businesses unlock their full potential through customized solutions designed to drive performance and inspire growth. Our team of experts work closely with clients to identify key challenges and implement strategies that foster collaboration, innovation, and sustainable success.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 16 2025

20 Patents

#1 in Stoke-on-Trent

#875 in United Kingdom

#30,330 in the World

Stoke-on-Trent, United Kingdom

Simon-hartley Limited

Forward Citations = 326

17 inventors:

Eric P Austin (11 out of 11 patents)

Paul J Lewis (4 out of 4 patents)

Anthony Pinches (4 out of 4 patents)

4. Geoffrey M Black (4 out of 4 patents)

5. Bernard Atkinson (4 out of 4 patents)

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