Searching US Patent Collection...

	PAT. NO.		Title
1	4,683,160		Solar cells with correlated roughness substrate
2	4,536,608		Solar cell with two-dimensional hexagonal reflecting diffraction grating
3	4,493,942		Solar cell with two-dimensional reflecting diffraction grating
4	4,398,056		Solar cell with reflecting grating substrate
5	4,310,910		Optimal polarization for the optical readout of high density video recording
6	4,236,823		Diffractometer for measuring signal depth and width
7	4,179,708		Optical playback system having increased depth-of-field
8	4,054,358		Recording a phase hologram having reduced intermodulation distortion