Caulfield; David D.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Caulfield; David D..The latest application filed is for "acoustic portal detection system".
- Caulfield; David D. - Spruce Grove Alberta CA
- Caulfield; David D. - Stony Plain CA
- Caulfield; David D. - Sherwood Park Alberta CA
| Patent | Date |
|---|---|
| Acoustic portal detection system Grant 6,870,791 - Caulfield , et al. March 22, 2 | 2005-03-22 |
| Acoustic Portal Detection System App 20050052948 - Caulfield, David D. ; et al. | 2005-03-10 |
| Array calibration and quality assurance App 20030088372 - Caulfield, David D. | 2003-05-08 |
| Material classification apparatus and method Grant 6,545,945 - Caulfield April 8, 2 | 2003-04-08 |
| Material classification apparatus and method App 20020159334 - Caulfield, David D. | 2002-10-31 |
| Acoustic detection apparatus Grant 4,922,467 - Caulfield May 1, 1 | 1990-05-01 |
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