Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 4665412 | Coupled heterostructure superlattice devices A superlattice quantum well device comprising a first set of conductive layers and a second set of conductive layers having discrete electronic energy levels different from those of the first set of layers, separated by relatively nonconductive insulation... | 05/12/1987 |
| 4581621 | Quantum device output switch Quantum-coupled devices, wherein at least two closely adjacent potential wells, (e.g. islands of GaAs in an AlGaAs lattice) are made small enough that the energy levels of carriers within the wells are discretely quantized. This means that, when the bias ... | 04/08/1986 |
| 4575924 | Process for fabricating quantum-well devices utilizing etch and refill techniques The present invention teaches a process for fabrication of quantum-well devices, in which the quantum-wells are configured as small islands of GaAs in an AlGaAs matrix. Typically these islands are roughly cubic, with dimensions of about 100 Angstroms per ... | 03/18/1986 |
