Johnstone; Duncan
Patent Applications and Registrations
Patent applications and USPTO patent grants for Johnstone; Duncan.The latest application filed is for "rotary impeller driven turbine".
- Johnstone; Duncan - McLean VA
- Johnstone; Duncan - Lannon WI
| Patent | Date |
|---|---|
| Vertical membrane storage system and method of storing liquids using the same Grant 6,726,846 - Johnstone April 27, 2 | 2004-04-27 |
| Rotary impeller driven turbine Grant 6,672,048 - Johnstone January 6, 2 | 2004-01-06 |
| Rotary impeller driven turbine App 20030010013 - Johnstone, Duncan | 2003-01-16 |
| Vertical membrane storage system and method of storing liquids using the same App 20020185438 - Johnstone, Duncan | 2002-12-12 |
| Modular industrial vacuum loading apparatus for ingesting and collecting debris and filtering discharged air Grant 4,735,639 - Johnstone April 5, 1 | 1988-04-05 |
| Industrial vacuum loader with dust removal means for bag house filtration system Grant 4,017,281 - Johnstone April 12, 1 | 1977-04-12 |
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