Did You Know...
...that it was melting ice cream that inspired the invention of the outboard motor? It was a lovely August day and Ole Evinrude was rowing his boat to his favorite island picnic spot. As he rowed, he watched his ice cream melt and wished he had a faster way to get to the island. At that moment the idea for the outboard motor was born!
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| Number | Title | Issue Date |
| 7248210 | Man-portable counter mortar radar system The present invention is a man-portable counter-mortar radar (MCMR) radar system that detects and tracks enemy mortar projectiles in flight and calculates their point of origin (launch point) to enable and direct countermeasures against the mortar and its personnel.... | 07/24/2007 |
| 6903679 | Video amplifier for a radar receiver A video amplifier for a radar receiver includes a temperature compensating attenuator. The attenuator includes a temperature sensitive device, such as a thermistor, arranged in a voltage divider network and is coupled in cascade between two filter stages. Each of th... | 06/07/2005 |
| 6456225 | Reflector circuit A reflector circuit is provided which responds to illuminating radiation with corresponding output radiation of increased magnitude relative to the illuminating radiation, while also providing a frequency selective limiting characteristic. The circuit com... | 09/24/2002 |
| 6067042 | Test beacon for radar system A test beacon for a radar system includes: a first antenna for receiving a search signal and transmitting a processed search signal, a second antenna for receiving a tracking signal and transmitting a processed tracking signal, a first signal processor fo... | 05/23/2000 |
| 6061017 | System for increasing isolation in active radar augmentation systems In an active radar augmentation system a microwave switch is connected been the receiving antenna and the amplifier. When there is an RF input signal to the receiving antenna of the augmentation system, a square wave timing signal provided to the microwa... | 05/09/2000 |
| 5786786 | Photonic radar decoy A photonic radar decoy (50) is provided which simulates an aircraft to a radar having an interrogating signal. A plurality of receiving antenna (52, 54, 56, 58, 60) are attached to the decoy (50) with each of the receiving antenna (52, 54, 56, 58, 60) ind... | 07/28/1998 |
| 5751238 | Active corner reflector An apparatus and method for providing small size, high gain corner reflection of radio frequency signals for use in military and commercial applications. Conventional corner reflector practice is combined with electronic amplifying reflection devices such... | 05/12/1998 |
| 5307068 | Tunable high-frequency devices A tunable high-frequency device using a superconductive thin layer with a thickness smaller than the thickness of penetration of a magnetic field is positioned on a dielectric layer. Also included is a means for varying the density of the Cooper pairs of ... | 04/26/1994 |
| 5164734 | Radar target with delayed reply means An active radar target device is disclosed. This device contains a means receiving a radar signal, a means for decreasing the frequency of the radar signal received, at least one means for delaying the reduced frequency radar signal, means for increasing ... | 11/17/1992 |
| 4989007 | Passive radar augmented projectile (PRAP) The invention disclosed relates to gun-launched target projectiles wherein a radar-augmentor is included to increase the radar cross-section of the projectile to simulate on radar, an actual airborne threat such as aircraft and missiles. The radar augment... | 01/29/1991 |
| 4642640 | Signal receptor-reradiator and surveillance tag using the same An improved receptor-reradiator, for use in a surveillance system employing a carrier frequency of UHF or higher in combination with a low frequency electrostatic field signal to be modulated on the carrier signal by the reradiator, is provided by an ante... | 02/10/1987 |
| 4612543 | Integrated high-gain active radar augmentor A compact and integrated high-gain radar augmented system, including: a cylindrical microstrip receive antenna mounted on a cylinder for providing nominal omni-directional coverage, a transmit antenna similar to the receive antenna mounted on the same cyl... | 09/16/1986 |
| 4513447 | Simplified frequency scheme for coherent transponders A coherent transponder having a transmitter and a receiver operating at different frequencies with each including a numerically controlled oscillator for controlling the frequency thereof through a single-sideband modulator and various outputs from a phas... | 04/23/1985 |
| 4374438 | Digital frequency and phase lock loop An improved jitter-free system for phase locking a locally generated signal with a received signal. The system provides and arithmetic synthesizer having a clock signal source which clocks a binary increment contained in an input register into the digital... | 02/15/1983 |
| 4302846 | Marker tag for a detection system This invention is directed to a receptor reradiator for use in a system for detecting the position of the receptor reradiator in a surveillance zone. It comprises a first aerial means for receiving the first signal, second aerial means for radiating said ... | 11/24/1981 |
| 4242671 | Transponders A tag transponder which is capable of receiving a signal from a transmitter and re-transmitting the signal after a delay. The incident electromagnetic wave from the transmitter is converted into an acoustic wave in a piezoelectric member of the tag, the a... | 12/30/1980 |
| 4215347 | Target seeker simulator An incoming enemy missile is simulated by pointing the radiation transmitg antenna of a drone missile, regardless of the actual movement of the drone, at the launch site of a friendly intercept missile or other friendly object without changing direction ... | 07/29/1980 |
| 4186396 | Radar beacon apparatus A radar beacon apparatus comprises a slot antenna for transmitting and a slot antenna for receiving which are respectively disposed in the substantially same axial direction and a transmitting unit and a receiving unit which are respectively connected to ... | 01/29/1980 |
| 4178596 | Radar augmentation system for airborne target An active radar augmentation system in a drone target aircraft, for the purpose of decreasing damage to the target. The system includes a receiving antenna in the nose, an amplifier, and a rear mounted transmitting antenna, connected by suitable cables.... | 12/11/1979 |
| 4163232 | Dual mode microwave mixer A four-port dual mode microwave mixer which operates without IF or RF switches and which provides both a passive mode of operation wherein the mixer operates as a lossy frequency translator when driven by a offset signal generator, and an active mode of o... | 07/31/1979 |
| 4156873 | Transponder for a moving vehicle tracking system In a Doppler (frequency shift) spacecraft tracking system, a transponder mounted on the spacecraft including, two or more, receivers connected to spaced-apart antennas for receiving an RF tracking signal transmitted from a ground based station regardless ... | 05/29/1979 |
| 4117485 | Radar target cross section control method and means Radar target back scattering is controlled by an impedance loading technique. The target is loaded with a variable impedance that is adjusted in response to the frequency of any incident radar signal to achieve optimum reflectivity for that particular fre... | 09/26/1978 |
| 4083004 | Expendable repeater employing harmonic mixing An expendable signal repeater for transmitting a replica of received signals in which the received signals are converted to an intermediate frequency by mixing in a down-converter with an upper harmonic of a heterodyning signal provided by a local oscilla... | 04/04/1978 |
| 4050070 | Programmable microwave modulator A programmable microwave modulator for controlling the amplitude of a micave signal versus time. A programmed driver generates a linear analog signal that has a predetermined amplitude pattern and time period. The linear analog signal from the programmab... | 09/20/1977 |
| 4017856 | Self-calibrating microwave transponder A self-calibrating microwave transponder incorporating an amplifier, modulator, instantaneous frequency discriminator, memory and voltage controlled oscillator is described which may generate an RF signal in response to the carrier frequency of received l... | 04/12/1977 |
| 4005418 | Cooperative signal processing beacon transponder A radar target enhancement system is provided whereby a received target signal is regenerated and retransmitted with the same frequency and pulse width as the received target sigal.... | 01/25/1977 |
