Issued Patents All Time
Showing 1–25 of 35 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7316523 | Acoustically matched method and apparatus for screeding concrete | J. Dewayne Allen | 2008-01-08 |
| 7114876 | Acoustically matched concrete finishing pans | J. Dewayne Allen | 2006-10-03 |
| 7108449 | Method and apparatus for acoustically matched slip form concrete application | J. Dewayne Allen | 2006-09-19 |
| 6857815 | Acoustic impedance matched concrete finishing | J. Dewayne Allen | 2005-02-22 |
| 6246153 | Positive feedback resonant transducer circuit | Clark D Boyd | 2001-06-12 |
| 6229247 | Multi-layer piezoelectric electrical energy transfer device | — | 2001-05-08 |
| 6182340 | Method of manufacturing a co-fired flextensional piezoelectric transformer | — | 2001-02-06 |
| 6150752 | Acoustic transducer with liquid-immersed, pre-stressed piezoelectric actuator in acoustic impedance matched transducer housing | — | 2000-11-21 |
| 6144142 | Multi-layer piezoelectric transformer mounting device | Samuel A. Face, Jr., Clark D Boyd | 2000-11-07 |
| 6127771 | Multi-layer piezoelectric transformer mounting device | Clark D Boyd | 2000-10-03 |
| 6124678 | Fluorescent lamp excitation circuit having a multi-layer piezoelectric acoustic transformer and methods for using the same | Clark D Boyd | 2000-09-26 |
| 6114797 | Ignition circuit with piezoelectric transformer | Clark D Boyd | 2000-09-05 |
| 6101880 | Feedback-responsive piezoelectric vibrating device | Samuel A. Face, Jr., Glenn F. Rogers, Jr. | 2000-08-15 |
| 6079214 | Standing wave pump | — | 2000-06-27 |
| 6074178 | Piezoelectrically actuated peristaltic pump | Bradbury R Face, Samuel A. Face, Jr., Stephen E. Clark, Norvell S. Rose | 2000-06-13 |
| 6075310 | Acoustic transducer with liquid-immersed, pre-stressed piezoelectric actuator in acoustic impedance matched transducer housing | — | 2000-06-13 |
| 6071088 | Piezoelectrically actuated piston pump | Bradbury R Face, Samuel A. Face, Jr., Stephen E. Clark, Norvell S. Rose | 2000-06-06 |
| 6054796 | Positive feedback resonant transducer circuit | — | 2000-04-25 |
| 6052300 | DC-AC converter circuit using resonating multi-layer piezoelectric transformer | Clark D Boyd | 2000-04-18 |
| 6042345 | Piezoelectrically actuated fluid pumps | Bradbury R Face, Samuel A. Face, Jr., Stephen E. Clark, Norvell S. Rose | 2000-03-28 |
| 6013972 | Piezoelectric vibrating apparatus | Samuel A. Face, Jr., Glenn F. Rogers, Jr. | 2000-01-11 |
| 6004499 | Method of aligning fibrous components of composite materials using opposed oscillating reflectors | Bradbury R Face | 1999-12-21 |
| 5962951 | Regenerative electric driver circuit | — | 1999-10-05 |
| 5918502 | Footwear incorporating piezoelectric spring system | — | 1999-07-06 |
| 5861702 | Piezoelectrically actuated ground fault interrupter circuit apparatus | Bradley D. Goldizen, Stephen E. Clark | 1999-01-19 |