Issued Patents All Time
Showing 1–25 of 35 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7014758 | Water treatment device | — | 2006-03-21 |
| 6536323 | Column packing and method for manufacturing the same | — | 2003-03-25 |
| 6538225 | Column packing and method for manufacturing the same | — | 2003-03-25 |
| 6488842 | Filtering device | — | 2002-12-03 |
| 6481325 | Column packing and method for manufacturing the same | — | 2002-11-19 |
| 6221320 | Device and method for holding catalyst in a radial flow reactor | — | 2001-04-24 |
| 6200467 | Filtering device with rotatable backwash tube | — | 2001-03-13 |
| 6177006 | Filtering device | — | 2001-01-23 |
| 6070739 | Filtering device | — | 2000-06-06 |
| 5954960 | Rotary drum type dehydrator | Arthur Leal | 1999-09-21 |
| 5901456 | Device for measuring distance between walls of coaxial cylindrical screens | — | 1999-05-11 |
| 5899031 | Partition structure having a screen | Takuzo Nakamura | 1999-05-04 |
| 5858235 | Sludge dehydrating press having cylindrical inner screen case | — | 1999-01-12 |
| 5787980 | Well screen having a uniform outer diameter | Derry D. Sparlin | 1998-08-04 |
| 5768851 | Structure unit | — | 1998-06-23 |
| 5705069 | Centrifugal water treatment device | — | 1998-01-06 |
| 5673726 | Method for weaving a multi-ply fabric packing with hexagonal cells | — | 1997-10-07 |
| 5643458 | Sludge dehydrating press and method for treating sludge | — | 1997-07-01 |
| 5622625 | Method of manufacturing a drum | — | 1997-04-22 |
| 5618424 | Rotary drum type device for separating solid particles from a liquid | — | 1997-04-08 |
| 5476143 | Well screen having slurry flow paths | Derry D. Sparlin, Jeff Ashton | 1995-12-19 |
| 5476588 | Multi-layer composite screen | — | 1995-12-19 |
| 5450898 | Gravity enhanced maintenance screen | Derry D. Sparlin | 1995-09-19 |
| 5415294 | Screen with a surface having projections or depressions | — | 1995-05-16 |
| 5377423 | Sludge dehydrating press and method for treating sludge | — | 1995-01-03 |