Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 4748449 | RF absorbing ablating apparatus A microwave absorbing ablating material is used as the ablative covering between the transmitting and receiving antennas while a standard ablating material, allowing the transmission of signals, is placed about the antennas. This allows signals to be tran... | 05/31/1988 |
| 4728554 | Fiber structure and method for obtaining tuned response to high frequency electromagnetic radiation The present invention relates to fiber structures and methods for obtaining tuned response to high frequency electromagnetic radiation, particularly at microwave frequencies. In one embodiment, a woven fabric is prepared with ferrite filled fibers oriente... | 03/01/1988 |
| 4725490 | High magnetic permeability composites containing fibers with ferrite fill High magnetic permeability composites are obtained by incorporating ferrite fibers in the composites. The ferrite fibers consist of a polymer and particulate ferrite fill at a concentration above the percolation threshold for the ferrite fill in the polym... | 02/16/1988 |
| 4713667 | Target support apparatus Target support structure for making bistatic radar cross section measurements. The support structure includes two parallel columns of circular cross section that may be coated with radar absorbing material. The rotational angle of the columns and the spac... | 12/15/1987 |
| 4695694 | Structure for minimizing microwave leakage Apparatus for using microwave energy to energize a light source which minimizes microwave leakage from a microwave cavity and yet permits a high percentage of light to be emitted from the cavity. The light transmitting window is made of two spaced-apart p... | 09/22/1987 |
| 4646644 | Pneumatic time delay valve A pneumatic time delay valve primarily adapted for use in the ejection system of electronic or optical countermeasure devices and the like wherein an explosive squib is employed to create a momentary charge of high pressure gas used to depress the firing ... | 03/03/1987 |
| 4572960 | Use of metallized knitted net fabrics for protection against microwave radiation Metallized, particularly nickel-coated, knitted net fabrics are suitable for protecting the eyes against microwave radiation with very little adverse effect upon the field of vision, particularly when the mesh width of the knitted net fabrics amounts to | 02/25/1986 |
| 4539433 | Electromagnetic shield An electromagnetic shielding material for absorbing electromagnetic energy has been found. The shielding material is flexible and has a thin conductive core with a composite ferrite material deposited around the core. The composite ferrite material is a m... | 09/03/1985 |
| 4538151 | Electro-magnetic wave absorbing material An electro-magnetic wave absorbing member comprises a mixture of short fibers of metal or alloy having a high electroconductivity, a length of from 0.1 mm to 50 mm and a length to diameter ratio of larger than 10, ferrite and a high molecular weight synth... | 08/27/1985 |
| 4522890 | Multilayer high attenuation shielding structure A composite structure of thin films including alternating layers of relatively high conductivity metals and low conductivity metals to combine the effects of reflection and absorption and thereby maximize the attenuation of the structure. Additionally, a ... | 06/11/1985 |
| 4507660 | Anechoic chamber An anechoic chamber utilizes an expanded central area resembling two flared horns with their rims fastened together, with the general vertex area of one of the horns forming the source area of the chamber and the other end the test or receiver end, there ... | 03/26/1985 |
| 4480256 | Microwave absorber An improved microwave absorber for coupling and absorbing radio frequency energy used for communication, navigation and radar systems. The structure has a conformal energy receiving surface for receipt on reflecting surfaces or surfaces supporting unwante... | 10/30/1984 |
| 4439768 | Metallized sheet form textile microwave screening material, and the method of use Metallized sheet-form textiles of synthetic polymers or natural fibres to which a metal layer has been applied by wet-chemical currentless deposition are particularly suitable for screening electromagnetic waves in the range from 10 MHz to 1000 GHz. Since... | 03/27/1984 |
| 4387467 | Satellite test chamber with electromagnetic reflection and resonance damping for simulating system generated electromagnetic pulses The simulation of systems generated electromagnetic pulses in a space environment for satellite testing is accomplished by means of a spherical test chamber that is coupled with a pulsed x-ray source. Resonance damping is provided by a spherical resistive... | 06/07/1983 |
| 4386354 | Electromagnetic noise suppression A method of reducing electromagnetic re-radiation of harmonic and intermodulation products by metal structures, having at least two adjoining elements, in response to an incident electromagnetic signal (rusty bolt effect). The method comprises the applica... | 05/31/1983 |
| 4381510 | Microwave absorber A microwave absorber for coupling and absorbing radio frequency energy used for communication, navigation and radar systems. The structure has a conformal energy receiving surface for receipt on reflecting surfaces or surfaces supporting unwanted surface ... | 04/26/1983 |
| 4353069 | Absorptive coating for the reduction of the reflective cross section of metallic surfaces and control capabilities therefor An absorptive coating for reduction of the reflective cross section of a metallic surface is provided which includes a layer of "N" doped material adjacent the metal surface, the N doped material having a characteristic of increasing semiconductor conduct... | 10/05/1982 |
| 4331959 | Method and apparatus for detecting a defective object on a lane or track A defective object such as a vehicle normally movable on a lane, assembly ne, or track is detected by a receiver on another object travelling behind the defective object, to avoid rear end collisions with the defective vehicle. For this purpose the vehicl... | 05/25/1982 |
| 4327364 | Apparatus for converting incident microwave energy to thermal energy A radar false target elimination system for converting incident microwave electromagnetic energy to thermal energy to preclude reflection of radar energy which would otherwise induce the generation of a beacon response and a false target from an aircraft ... | 04/27/1982 |
| 4173018 | Anti-radar means and techniques Magnetizable particles ranging in size from 0.5 to 20 microns are dispersed in an insulating binder of thermosetting material to form a mixture in which such particles comprise approximately 90% of the weight of such mixture. The particles are either sphe... | 10/30/1979 |
| 4170010 | Inflatable radiation attenuator An arrangement for providing an inflatable cover or structure having radar-energy absorbing characteristics. Thus, a structure may be either formed of, or covered by, this material -- which may be compacted during certain stages of its life, and inflated ... | 10/02/1979 |
| 4155087 | Radar receiver for detecting coded information buried in radar echoes An IFF radar system having a processor for analyzing radar reflections to termine if the reflections were artificially modulated by a cooperative target in accordance with some predetermined code. The processor ignores modulations in the radar reflections... | 05/15/1979 |
| 4131845 | Microwave moisture sensor chute The present invention is directed to a moisture measuring apparatus which comprises a chute means of a given length for receiving moisture containing material, the chute means having window opening means through which microwaves are transmitted. The trans... | 12/26/1978 |
| 4086591 | Small aperture antenna A device for reducing the backlobe radiation from small aperture antennas is shown to comprise a thin hemispherical radome having both radio frequency energy absorbing and reflecting materials attached thereto. The absoring material dissipates a portion o... | 04/25/1978 |
| 4038660 | Microwave absorbers Microwave absorbers reduce radar cross-sections of airborne objects by attenuating reflectivity values. In Jaumann absorbers laminated layers are placed on the reflecting surfaces, the laminated layers being lossy layers separated by dielectric spacing la... | 07/26/1977 |
| 4024318 | Metal-filled plastic material A filled plastic composition, suitable for use as a radar shield, comprising (1) a first layer of hydrocarbon thermosetting plastic filled with metal particles of aluminum, iridium, tin, lead, bismuth, or elements from Group IIB to Group VIIB of the Perio... | 05/17/1977 |
| 4012738 | Combined layers in a microwave radiation absorber 2. Combined layers in a microwave radiation absorber comprising a layer of ielectric material of relatively high dielectric constant and a layer of magnetic material having a relatively high coefficient of magnetic permeability, said layers being substanti... | 03/15/1977 |
| 4006479 | Method for dispersing metallic particles in a dielectric binder A method for accomplishing the uniform distribution of finely divided metallic particles throughout a dielectric binder material. The finely divided metal particles are first admixed with a finely divided dielectric material and then further mixed with a ... | 02/01/1977 |
| 4003840 | Microwave absorber Microwave absorber comprising a mixture of ferrite powder having particle size of less than 1.65 mm and an organic high molecular weight compound.... | 01/18/1977 |
| 3938152 | Magnetic absorbers 1. In an absorber for minimizing reflections of electromagnetic radiation of preselected radar wave lengths in the approximate corresponding preselected frequency range of 10 megacycles to 15,000 megacycles wherein a layer of absorber material has a highl... | 02/10/1976 |
