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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 |
| 4644794 | Acoustic guide for noise-transmission testing of aircraft The invention is an apparatus which allows selective testing of aircraft or other vehicular components without requiring disassembly of the vehicle or components. The invention consists of a broad-band noise source 11, a guide 12 to direct the acoustic en... | 02/24/1987 |
| 4631538 | Single frequency multitransmitter telemetry system A telemetry system in which a plurality of transmitters are frequency shift keying modulated. A receiver including an overlapping detector retains the transmitted data when there is no overlap in data transmitted and discards the transmitted data when the... | 12/23/1986 |
| 4629147 | Over-the-wing propeller This invention is an aircraft 10 with a system for increasing the lift-drag ratio over a broad range of operating conditions. The system positions the engines and nacelles 15 over the wing 12 in such a position that gains in propeller 16 efficiency is ach... | 12/16/1986 |
| 4624561 | Vibration-free Raman Doppler velocimeter Method and apparatus unaffected by vibrational environments for obtaining measurements using Raman Doppler Velocimetry. Two laser beams, a pump beam 18 and a probe beam 22, are focused by a lens 21 to a point 25 in a flow 11. A lens 26 collimates the two ... | 11/25/1986 |
| 4622182 | 5-(4-ethynylophenoxy)isophthalic chloride Sulfone-ester polymers containing pendent ethynyl groups and a direct and multi-step process for preparing same are disclosed. The multi-step process involves the conversion of a pendent bromo group to the ethynyl group while the direct route involves rea... | 11/11/1986 |
| 4545025 | Auto covariance computer A laser velocimeter covariance processor which calculates the auto covariance and cross covariance functions for a turbulent flow field based on Poisson sampled measurements in time from a laser velocimeter. The device will process a block of data that is... | 10/01/1985 |
| 4543295 | High temperature polyimide film laminates and process for preparation thereof High temperature polyimide film laminates and a process for fabricating large-area, void-free polyimide laminate structures wherein multiple-ply polyimide film laminates may be constructed without decreasing the individual film strength and wherein layers... | 09/24/1985 |
| 4518277 | Self-locking mechanical center joint A device for connecting, rotating and locking together a pair of structural half-columns 11 is disclosed. The device is composed of an identical pair of cyclindrical hub assemblies 12,12a connected at their inner faces by a spring loaded hinge 20; each hu... | 05/21/1985 |
| 4513750 | Method for thermal monitoring subcutaneous tissue A noninvasive accurate method for measuring the temperature of tissue beneath the surface of a living body 11. Ultrasonic signals (14) are directed into beads 13 of a material that are inserted into the tissue with a syringe. The reflected signals (15) in... | 04/30/1985 |
| 4512661 | Dual differential interferometer A dual two-beam differential interferometer that measures both the amplitude and orientation of propagating, broadband surface acoustic waves. Four beams are focused on a surface. The four reflected beams are separated into two pairs. The two pairs are de... | 04/23/1985 |
| 4511838 | Method for determining the point of zero zeta potential of semiconductor A method for determining the potential of zero charge of an unpowdered semiconductor material. The semiconductor material is used as the working electrode 12 of a standard three-electrode photoelectrochemical cell 11. The onset potential of the semiconduc... | 04/16/1985 |
| 4458418 | Tubing and cable cutting tool This invention relates to a hand held hydraulic cutting tool particularly useful to deactivate ejection seats in military aircraft rescue operations. The tool consists primarily of a hydraulic system composed of a fluid reservoir 11, a pumping piston 16, ... | 07/10/1984 |
| 4398667 | Apparatus and method for jet noise suppression A method and apparatus for jet noise suppression through control of the static pressure of the jet and control of the rate of entrainment of ambient fluid into the jet downstream of the exhaust nozzle is disclosed and serving to regulate the momentum flux... | 08/16/1983 |
| 4395540 | Thermoset-thermoplastic aromatic polyamide containing N-propargyl groups A novel composition and method for increasing the use temperature of polyamides based on the incorporation of a latent crosslinking agent into the polymer backbone, wherein high temperature performance is achieved without sacrificing solubility or process... | 07/26/1983 |
| 4393716 | Fixture for environmental exposure of structural materials under compression load The present invention relates to a device for stressing a deformable material specimen. The apparatus consists of top plate 11 and bottom plate 12 sandwiching a guide cylinder 13. The specimen 14 is positioned on the bottom plate 12 and attached to a load... | 07/19/1983 |
| 4375536 | Polyphenylquinoxalines containing pendant phenylethynyl and ethynyl groups Poly(phenylquinoxaline) prepolymers containing pendant phenylethynyl and ethynyl groups are disclosed along with the process for forming these polymers. Novel monomers and the process for producing same that are employed to prepare the novel polymers are ... | 03/01/1983 |
| 4344591 | Multiwall thermal protection system Multiwall insulating sandwich panels are provided for thermal protection of hypervelocity vehicles and other enclosures. In one embodiment of the invention the multiwall panels are formed of alternate layers of dimpled and flat metal (titanium alloy) foil... | 08/17/1982 |
| 4341012 | Pyroelectric detector arrays A pyroelectric detector array and the method for making it. A series of holes 13 formed through a silicon dioxide layer 12 on the surface of a silicon substrate 11 forms the mounting fixture for the pyroelectric detector array. A series of nontouching str... | 07/27/1982 |
| 4340318 | Mechanical end joint system for structural column elements A mechanical end joint system, useful for the transverse connection of strut elements to a common node, comprises a node joint half 15 with semicircular tongue 14 and groove 60 and a strut joint half 24 with semicircular tongue 25 and groove 21. The two j... | 07/20/1982 |
| 4335206 | Apparatus and process for microbial detection and enumeration An apparatus and process for detecting and enumerating specific microorganisms from large volume samples containing small numbers of the microorganisms wherein the large volume samples are filtered through a membrane filter 23 to concentrate the microorga... | 06/15/1982 |
| 4331422 | Acoustic tooth cleaner This invention is an acoustic oral hygiene unit that uses acoustic energy to oscillate mild abrasive particles 17a in a water suspension 17 which is then directed in a low pressure stream onto the teeth. The oscillating abrasives scrub the teeth clean rem... | 05/25/1982 |
| 4331873 | Photocapacitive image converter Apparatus for converting a radiant energy image into corresponding electrical signals including an image converter. The image converter includes a substrate 20 of semiconductor material, an insulating layer 23 on the front surface of the substrate and an ... | 05/25/1982 |
| 4330100 | Means for controlling aerodynamically induced twist A wing twist deformation control mechanism which provides active compensation for aerodynamically induced twist deformation of high aspect ratio wings. The twist deformation control mechanism consists of a torque tube, internal to each wing and rigidly at... | 05/18/1982 |
| 4327581 | Metric half-span model support system The invention relates to a model support system used to support a model in a wind tunnel test section. The model comprises a metric, or measured, half-span 12 supported by a nonmetric, or nonmeasured half-span 11 which is connected to a sting support 13. ... | 05/04/1982 |
| 4317102 | Hot foil transducer skin friction sensor An improved hot wire transducer skin friction sensor 10 and 19. The device utilizes foil transducers 11 and 18 with only one edge exposed to the fluid flow. The surface 28 and 31 are polished producing a foil transducer 11 and 18 that does not generate tu... | 02/23/1982 |
| 4311615 | Electrically conductive palladium containing polyimide films This invention relates to improved lightweight, high temperature resistent, electrically conductive, palladium containing, polyimide films and methods of preparing same for use in aerodynamic and space application. A palladium (II) ion-containing polyamic... | 01/19/1982 |
| 4310906 | Liquid-immersible electrostatic ultrasonic transducer A broadband megahertz range electrostatic acoustic transducer for use in a liquid environment. A liquid-tight enclosure 11 which includes a metallic conducting membrane 18 as part of its outside surface has a means 19 inside the liquid-tight enclosure for... | 01/12/1982 |
| 4265416 | Orbiter/launch system An orbit vehicle launch system including reusable turbojet propelled booster vehicles releasably connected to a reusable rocket powered orbit vehicle. The coupled orbiter-booster combination takes off horizontally and ascends to staging altitude and speed... | 05/05/1981 |
| 4264908 | Adaptive polarization separation A broadband adaptively controlled polarization separation network. Two transmitted signals vertically and horizontally polarized are received as elleptically polarized signals. One of the two received elliptically polarized signals is automatically adjust... | 04/28/1981 |
| 4264728 | Indirect microbial detection The growth of microorganisms in a sample is detected and monitored by culturing microorganisms in a growth medium and detecting a change in potential between two electrodes separated from the microbial growth by a barrier which is permeable to charged par... | 04/28/1981 |
| 4261537 | Velocity vector control system augmented with direct lift control A pilot controlled stability control system that employs direct lift control (spoiler control) with elevator control to control the flight path angle of an aircraft. A computer on the aircraft generates an elevator control signal and a spoiler control sig... | 04/14/1981 |
| 4259821 | Lightweight structural columns Lightweight half-lengths of columns for truss structures that are adapted for nestable storage and transport to facilitate fabrication of large area truss structures at a remote site and particularly adaptable for space applications.... | 04/07/1981 |
| 4255048 | Direction sensitive laser velocimeter A laser velocimeter that determines the direction of movement of particles. A laser produces a transmitted beam that illuminates the volume under investigation. The backscattered light is divided into two equal intensity beams. A first part of a sample of... | 03/10/1981 |
| 4236684 | Thrust augmented spin recovery device Yaw control surfaces are provided for a jet propelled aircraft wherein a thrust augmented rudder is disposed above the jet exhaust stream and a thrust rudder tab extends downward therefrom into the jet exhaust stream with these components being cooperativ... | 12/02/1980 |
| 4233258 | Method for preparing addition type polyimide prepregs A novel addition polyimide based on the use of liquid monomers wherein the essentially solventless prepreg produced therefrom retains good drape, tack and other mechanical properties.... | 11/11/1980 |
| 4229473 | Partial interlaminar separation system for composites This invention relates to an interlaminar separation system for composites wherein a thin layer of a perforated foil film is interposed between adjacent laminae of a composite formed from prepreg tapes to thereby permit laminae adherence through the perfo... | 10/21/1980 |
| 4225102 | Aerodynamic side-force alleviator means Apparatus for alleviating high angle-of-attack side force on slender pointed cylindrical forebodies such as fighter aircraft, missiles and the like and employing a symmetrical pair of helical separation trips to disrupt the leeside vortices normally attai... | 09/30/1980 |
| 4210401 | Visible and infrared polarization ratio spectroreflectometer The instrument disclosed assists in determining the refractive index and absorption index, at different spectral frequencies, of a solid sample by illuminating the sample at various angles in incidence and measuring the corresponding reflected intensities... | 07/01/1980 |
| 4206721 | Retainer for murine specimens and test equipment A device for immobilizing live animals to permit laboratory examination thereof. The device consists of a base plate to which guides and pins are attached, and with cantilever arms disposed on and rotatably and vertically movable relative to the pins. The... | 06/10/1980 |
| 4206970 | Chromatically corrected virtual image visual display An in-line, three element, large diameter, optical display lens having a front convex-convex element, a central convex-concave element, and a rear convex-convex element. The lens, used in flight simulators, magnifies an image presented on a televison moni... | 06/10/1980 |
