BioSolar Inc. of Santa Clarita, Calif., announced it recently filed a patent application related to its proprietary BioBacksheet, a three-layer laminate consisting of a recyclable aluminum foil center sandwiched between two layers of bio-based polymer films made from renewable plant sources. BioSolar said the product provides an absolute moisture barrier for the thin-film solar cell market and can reduce the cost of photovoltaic solar modules. Testing is continuing on the initial pilot line run of BioBacksheet as it moves toward commercialization, the company said.