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Clearwater, FL, United States of America

John H Douglas

Average Co-Inventor Count = 1.06

ph-index = 7

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 = 117

John H DouglasWilliam G Cunningham (1 patent)John H DouglasJohn H Douglas (9 patents)William G CunninghamWilliam G Cunningham (1 patent)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Paragon Water Systems, Inc. (3 from 22 patents)

2. Other (2 from 832,718 patents)


9 patents:

1. 6796518 - Multi-function showerhead filter system

2. D484569 - Showerhead

3. 6599428 - Filter system for removing contaminants from water and method thereof

4. D417904 - Showerhead filter system

5. D416072 - Showerhead filter

6. 5975434 - Showerhead system with turbulence inducing and water purification means

7. D413371 - Combined showerhead and filter

8. D403406 - Water purification unit

9. D372515 - Water purification unit

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as of
12/11/2025
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