Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 4584580 | Apparatus for rejecting jamming waves A variable-narrow-band rejection filter is inserted in a reception signal path for rejecting a jamming wave. Signals at input and output terminals of the narrow-band rejection filter are picked up by a pair of first and second bandpass filters each having... | 04/22/1986 |
| 4024383 | Method and system for navigation employing incremental range difference A navigation method and system suitable for highly accurate all-weather navigation of vehicles such as ships and aircraft. An initial position of the vehicle relative to a plurality of known points each located at predetermined geographic positions is fir... | 05/17/1977 |
| 3981015 | Phase locking of time-sequential transmission from spaced transmitters in a phase comparison naviagation system In a phase comparison radio navigation system in which a prime and one or more secondary transmitting stations radiate phase-locked signals of the same frequency in a time-shared sequence, phase locking at the secondary station or stations is effected by ... | 09/14/1976 |
| 3974502 | Phase comparison radio navigation system receiver having phase memory oscillators for phase locking to time-sequentially received transmissions In a phase comparison radio navigation system in which spaced transmitters radiate phase-locked signals in a time-shared sequence, in order to enable a receiver to be operated on any selected one of a large number of different frequencies, a phase memory ... | 08/10/1976 |
| 3974503 | Phase comparison radio navigation system with time-sequenced transmissions from spaced stations using selectable phase memory oscillators in a receiver In a phase comparison radio navigation system in which phase-locked signals are radiated from spaced stations to be compared in phase in a receiver, the receiver has a separate phase memory oscillator for each received signal, the phase memory oscillators... | 08/10/1976 |
| 3973261 | Synchron timing of signals in spaced transmitters and in a receiver for a phase comparison navigation system using time sequential transmissions In a phase comparison radio navigation system using transmissions from spaced stations in a time-sequence, for synchronising the timing of the transmissions, and for synchronising switching in a receiver, the timing control means include digital counting ... | 08/03/1976 |
