Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 4129870 | Apparatus for synthesis of scanning beam Radio frequency energy is rapidly switched from a transmitter in a repeating sequence of bursts of radio frequency energy to the different ones of a plurality of radiation beam ports, and the individual bursts of radio frequency energy are modulated in a ... | 12/12/1978 |
| 4119969 | Scanning beam navigational beacon with transmitted coherence reference signal and thinned two-dimensional phased array A scanning beam navigational beacon for transmission to a remote station (aircraft, for example) which measures a navigational angle therefrom. A thinned, two-dimensional main antenna array and linear reference array are provided. A single antenna element... | 10/10/1978 |
| 4109249 | Scanning beam receiver A scanning beam radio guidance system in which a ground beacon equipment transmits a single frequency collimated beam which sweeps a space sector of interest, and also transmits a frequency offset reference signal. An airborne remote receiver is responsiv... | 08/22/1978 |
| 4063242 | Doppler navigation system with reference signal source diversity A Doppler Radio Navigation beacon with multi-element reference and main commutated arrays. The reference signal is programmed among the reference array elements irregularly to provide spatial diversity to the reference signal to eliminate or substantially... | 12/13/1977 |
| 4050074 | Blended step scan beam signal from fixed beam components Radio frequency energy is rapidly switched from a transmitter in a repeating sequence of bursts of radio frequency energy to the different ones of a plurality of radiation beam ports, and the individual bursts of radio frequency energy are modulated in a ... | 09/20/1977 |
| 4041492 | Radio navigation with separate correlated scans to avoid reflection interference Where a signal reflective fixed obstruction is present in a subsector of a navigation angle sector in which guidance is required, scanning beams are employed including a main scan which is scanned over most of the navigation angle sector and an auxiliary ... | 08/09/1977 |
| 4017862 | Aircraft guidance system A ground installation for an aircraft landing system has an array of transmitting elements located on the arc of a circle. When the elements are activated sequentially either in one direction ("to") or the other ("fro"), a signal is transmitted which, whe... | 04/12/1977 |
| 3999182 | Phased array antenna with coarse/fine electronic scanning for ultra-low beam granularity An antenna and scanning means therefor particularly useful in an aircraft landing system operating in the microwave frequency range. The antenna is of the line phased array type which includes digitally controlled phase shifters for each of the radiating ... | 12/21/1976 |
| 3971026 | Multiple beam glide slope radio navigation method with two classes of beams Microwave carrier frequency energy is switched from one beam to another to provide a switched scanning beam for the glide slope function for an instrument landing system. The beams comprise a plurality of upper beams of uniform angular width in elevation ... | 07/20/1976 |
| 3964053 | Aircraft guiding system 1. A system adapted to guide an aircraft along a path defined by frequency modulated signals of a transmitted conical scan pattern, comprising a receiver carried by said aircraft to receive said signals, means to detect from said signals and the amplitude... | 06/15/1976 |
| 3943518 | Doppler ILS receiver with beat signal scan synchronization Radio navigation receiver apparatus for operation with ground beacon equipment of the simulated Doppler type (having a commutated array). The receiver derives a beat between the received ground beacon (commutated) signals and a reference signal also from the g... | 03/09/1976 |
| 3939472 | Coded navigation system In a navigation system in which a beam of radiation is utilized for communicating information to a vehicle, such as an aircraft approaching a landing strip, there is provided a pseudo-noise generated binary code having sequentially generated bits ordered ... | 02/17/1976 |
