Abstract: A method for making epoxy reinforced by gelatin by forming gelatin-epoxy sheets. Initially the gelatin is carried on a non-bonding support and receives the desired epoxy coating which bonds to the gelatin. Next the coating is cured and the support is peeled from the gelatin leaving a gelatin reinforced epoxy sheet stock material. The opposite side of the gelatin may be coated in the same manner.

Abstract: Epoxy is reinforced by gelatin to form gelatin-epoxy sheets. Initially the gelatin is carried on a non-bonding substrate for support and receives the desired epoxy coating which bonds to the gelatin. Next the coating is cured and the substrate is peeled from the gelatin leaving a gelatin reinforced epoxy sheet stock material. The opposite side of the gelatin may be coated in the same manner.

Abstract: An error checking method and apparatus for recording digital data in an optical recording medium. Digital data are written onto the medium by a modulated laser whose beam is detected by a first photodetector means which measures laser output directed toward the recording medium. A second photodetector means measures light scattering from the medium, while a third photodetector detects and measures light transmitted through the recording layer of the medium serving to confirm recording of the data. Amounts of transmitted light or scattered light from the medium are correlated to the laser output and to expected values of light for detecting errors in recording immediately after the time of recording. Reversal processing of the recording medium eliminates a large fraction of potential errors.