Abstract: An underwater hydroelectric turbine comprises a turbine housing having an inlet and an outlet, a central shaft extending axially inside the turbine housing, a self-contained, sealed front bearing unit for rotationally supporting a front end of the central shaft, and a self-contained, sealed rear bearing unit for rotationally supporting a rear end of the central shaft. The front bearing unit and the rear bearing unit each comprises a self-powered lubricant circulation system that draws a fraction of the mechanical power from rotation of the central shaft to circulate lubricant through each respective bearing unit. The turbine may have an equilibrium chamber for automatically balancing lubricant pressure inside a lubricant-containing chamber of the bearing chambers with ambient water pressure outside the bearing housing.

Abstract: The invention consists of developing an environmentally friendly new energy converter using light weight material. The energy converter shall be fully submersed in running undercurrents waters and have high overall efficiency ratio. The energy converter consists of, among other things, eliminating the in-line electric generator and substitute it with peripheral electro-magnetic coupling device, attached to the runner tip from inside and surrounding the energy converter housing from outside. The energy converter electric brushless circuits and winding must be totally sealed from water, using new sealing techniques and shall be also electrically isolated as well. The energy converter allows extracting energies from undercurrents with large frequency and voltage ranges.

Abstract: A tape is disclosed including a flexible substrate having a first zone and a second zone, a first layer of adhesive disposed at the first zone and a second layer of adhesive disposed at the second zone. The tape can be permanently affixed to one surface and readily removable from another surface. An attachable protective sheet arrangement includes at least one piece the tape and a protective flexible sheet. The first zone is permanently affixed to the flexible sheet and the second zone is available for attachment to a surface.

Abstract: A zone adhering adhesive tape material for releasably retaining one or more electric or electronic conduit members of interest or the like in position with respect to an adjacent surface is disclosed which includes a continuous, flexible web of backing material in strip form and a pair of spaced parallel zones of adhesive material applied along both edges of one side of the backing material defining a relatively wide non-adhesive zone therebetween. The material attaches the conduit members releasably under the non-adhesive zone.

Abstract: A zone adhering adhesive tape material for releasably retaining one or more electric or electronic conduit members of interest or the like in position with respect to an adjacent surface is disclosed which includes a continuous, flexible web of backing material in strip form and a pair of spaced parallel zones of adhesive material applied along both edges of one side of the backing material defining a relatively wide non-adhesive zone therebetween. The material attaches the conduit members releasably under the non-adhesive zone.