Hallett; Douglas J.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Hallett; Douglas J..The latest application filed is for "ultraviolet treatment for aqueous liquids".
- Hallett; Douglas J. - Acton CA
| Patent | Date |
|---|---|
| Ultraviolet treatment for aqueous liquids Grant 6,773,608 - Hallett , et al. August 10, 2 | 2004-08-10 |
| Method and apparatus for treatment of organic waste material Grant 5,704,557 - Hallett , et al. January 6, 1 | 1998-01-06 |
| Process for the destruction of organic waste material Grant 5,050,511 - Hallett , et al. September 24, 1 | 1991-09-24 |
| Process for the destruction of organic waste material Grant 4,819,571 - Hallett April 11, 1 | 1989-04-11 |
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