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| Number | Title | Issue Date |
| 5814921 | Frequency multiplying piezoelectric generators Piezoelectric electrical generators comprise cantilevered beams of piezoelectric material, cross sections of the beams preferably being triangular and of increasing area from free end to fixed end. Arrays of spaced apart beams are disposed in overlapping,... | 09/29/1998 |
| 5703474 | Power transfer of piezoelectric generated energy The electric energy generated by a piezoelectric device (PEG), when mechanically stressed, is transferred from the PEG to a storage element (e.g., a capacitor or a battery) by selectively coupling an inductor in the conduction path between the PEG and the... | 12/30/1997 |
| 5621264 | Water craft using piezoelectric materials A flexible layer of piezoelectric material, e.g., a known PVDF polymer, is used for generating electrical energy for use on a water craft. In one arrangement, the sheet is laminated within a craft hull of fiberglass. Electrodes are provided for the major ... | 04/15/1997 |
| 5578889 | Piezoelectric generation of electrical power from surface waves on bodies of water using suspended weighted members A system for converting the mechanical energy of ocean waves to electrical energy comprises a weighted member supported from a piezoelectric element for applying a preselected strain to the element. In one embodiment, the element is supported by a float f... | 11/26/1996 |
| 5552657 | Generation of electrical energy by weighted, resilient piezoelectric elements Disposed within a float on the surface of a body of water is a vertically suspended, resilient piezoelectric element provided with a preselected strain by a hanging weight. The piezoelectric system functions as a weighted coiled spring which is driven int... | 09/03/1996 |
| 5552656 | Self-powered anti-fouling device for watercraft An anti-fouling device comprises a layer of piezoelectric material, preferably a poled plastic material such as a PVDF polymer, for mounting on the hull of a watercraft. The layer has electrodes on opposite major surfaces thereof, and the layers are conne... | 09/03/1996 |
| 5548177 | Piezoelectric generator protection A known type of piezoelectric power generating system for converting the mechanical energy of waves on a body of water comprises a float and a piezoelectric power generating element suspended, under tension, between the float and a bottom anchor. For prev... | 08/20/1996 |
| 5512795 | Piezoelectric electric energy generator An electrical energy generator comprises a cylindrical stator, a cylindrical liner of a piezoelectric material in concentric contact with the stator, and an armature rotatable about the liner. In one embodiment, as the armature rotates, the armature squee... | 04/30/1996 |
