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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 4422179 | Electrical-optical interface network An electrical-optical interface network for use in a carrier-sense, multiple-access system with collision-detection provides two-way transmission between an electrical circuit (5,7,9) and a pair of lightguides (21,22), but prevents signal transmission bet... | 12/20/1983 |
| 4415872 | Adaptive equalizer The dispersive effects of frequency selective fading in a digital, FM, or AM radio system are reduced by means of an adaptive equalizer (11) comprising a cascade of feed-forward stages (1,2, . . . N), each of which includes: a first parallel wavepath (1-1... | 11/15/1983 |
| 4403826 | Ultraviolet radiation detector Small, highly sensitive uv detectors are fabricated utilizing the fluorescence induced in the core of an optical fiber when illuminated by uv radiation. The fluorescence light is then guided by the fiber itself, by a similar fiber or by a different optica... | 09/13/1983 |
| 4400813 | Crenelated-ridge waveguide laser The ridge-structure in a ridge waveguide laser is notched at periodic intervals to produce a longitudinally crenelated ridge, and the electrode on the ridge side of the laser is alloyed only to the topmost surfaces of the ridge. As a result, the active re... | 08/23/1983 |
| 4390236 | Tunable polarization independent wavelength filter Tunable, polarization independent wavelength filtering is obtained in a circuit configuration comprising an input polarization selective coupler which separates the TM and TE mode waves. A first, wavelength selective mode converter, in the TE mode wavepat... | 06/28/1983 |
| 4386239 | Multifrequency tone detector A signal recognition circuit (10) is disclosed which is capable of distinguishing between the digit tones used for dialing in multifrequency tone telephone sets, and spurious signals at the same frequencies, such as noise and voice. The discriminator comp... | 05/31/1983 |
| 4384760 | Polarization transformer A generalized polarization transformer (10) is disclosed that is capable, under electrical control, of transforming the polarization of a signal between two arbitrary states. In its most general form, the transformer comprises a variable input phase shift... | 05/24/1983 |
| 4381139 | Velocity mismatched modulator The coupling efficiency between a pair of identical optical waveguides (11, 12) is modulated by a traveling electrical wave (14, 15). Because the propagating constants of the optical and modulating systems are not equal, the interaction between them is li... | 04/26/1983 |
| 4381138 | Electrooptic devices The response, as a function of frequency, of electrooptic mode converters using comb electrodes has been found to include several peaks at frequencies above and below the desired frequency. These spurious peaks appear to be caused by fringing of the elect... | 04/26/1983 |
| 4373210 | Space diversity combiner The benefits of space diversity combining in the presence of interference has been found to depend upon the signal-to-interference ratios at the two antennas. For optimum results, the signal-to-interference ratios should not differ by more than &#b1;3 dB.... | 02/08/1983 |
| 4372645 | Optical fiber with enhanced mode coupling Optical fibers having enhanced mode coupling produced by an asymmetric refractive index profile that varies periodically along the length of the fiber are described. The prescribed variations are obtained by means of a fabrication process that includes pe... | 02/08/1983 |
| 4373207 | Space diversity signal combiner In a diversity signal combiner, the weaker of the two signals is attenuated an amount that varies as a function of the phase angle between the two signals. When the phase angle is small, the attenuation is small and the two signals add together. As the ph... | 02/08/1983 |
| 4370745 | Fail-safe transmission system Transmission configurations are described for providing usable service despite the complete interruption of one or more of several transmission links. This is accomplished by encoding (11) the information content of each of a plurality of input signals (S... | 01/25/1983 |
| 4368063 | Method of fabricating a tapered torch nozzle VAD torches include a plurality of coaxially aligned tubes. A typical outside diameter is about 1 inch. To fabricate smaller torch nozzles, spacers (20, 21, 22) are symmetrically placed between adjacent tubes (11, 12, 13, 14), and the entire tube assembly... | 01/11/1983 |
| 4362943 | Method of measuring the refractive index profile and the core diameter of optical fibers and preforms Shaping of the refractive index profile of an optical fiber is typically achieved by changing the concentration of an index-modifying dopant within the glassy matrix preform. To measure the profile and the core diameter of the preform, in accordance with ... | 12/07/1982 |
| 4361892 | Adaptive equalizer An adaptive equalizer is disclosed comprising an amplitude equalizer circuit (12) having an adjustable Q, and a plurality of all-pass circuits (14,15) having adjustable delay bumps. A controller (18) adjusts the tuning, magnitude of the bumps, and the num... | 11/30/1982 |
| 4354276 | Equalizing signal combiner In a space diversity receiver, the relative phase of the two received signals is varied in manner to minimize amplitude dispersion in the combined signal. A phase control signal is derived from the combined signal by phase modulating one of the received s... | 10/12/1982 |
| 4330764 | Multipath fade equalizer An adaptive multipath fade equalizer is disclosed comprising differencing means (24) for forming a difference between an input equal to said equalizer and a component of the equalizer output signal and a feedback loop (21) for coupling said component of o... | 05/18/1982 |
| 4064458 | Electromagnetic wave communication systems The proper utilization of that portion of the millimeter wave spectrum that is particularly highly absorbed by the atmosphere is shown in conserve frequency spectrum while permitting a high density of users operating in relatively close proximity.... | 12/20/1977 |
| 3962541 | Frequency sample-and-hold circuit A method and apparatus are described for reproducing the frequency of an incoming reference signal that persists for only a limited period of time. This is accomplished by counting, during the duration of the reference signal, the number of cycles of a lo... | 06/08/1976 |
| 3946335 | Stabilization circuit for radiation emitting diodes A particularly important factor limiting the reliability of diode lasers is the catastrophic mirror damage which occurs when the radiated output exceeds a critical value. Experience has shown that this occurs as a result of fluctuations in the drive curre... | 03/23/1976 |
