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A high voltage is applied to an arc gap adjacent to a test specimen to develop a succession of high-frequency arc discharges. Those high frequency arc discharges generate pulses of ultrasonic energy within the test specimen without requiring the arc discharges to contact that test specimen and without requiring a coupling medium between those arc discharges and that test specimen. Those pulses can be used for detection of flaws, for measurement of certain properties of the test specimen, and for measurement of stresses within that test specimen.

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MICROWAVE POWER TRANSMISSION SYSTEM

WHEREIN LEVEL OF TRANSMITTED POWER IS
CONTROLLED BY REFLECTIONS FROM RECEIVER

NASA Case No. MFS-21470-1

Canada, France, Germany,
Great Britain, Japan,
Netherlands

Address inquiries to:

Marshall Space Flight Center
Attn: Patent Counsel

Mail Code: CC01
Huntsville, AL 35812
U.S.A.

[Corresponding to U.S. Patent No. 3,795,910]

This invention is a microwave, wireless, power transmission system in which the transmitted power level is adjusted to correspond with power required at a remote receiving station in which deviations in power load produce an antenna impedance mismatch causing variations in energy reflected by the power receiving antenna employed by the receiving station. The variations in reflected energy are sensed by a receiving antenna at the transmitting station and used to control the output power of a power transmitter.

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REFRACTORY PORCELAIN ENAMEL PASSIVE CONTROL COATING FOR HIGH TEMPERATURE ALLOYS

NASA Case No. MFS-22324

Australia, Canada, France,

Germany, Great Britain,
Japan, Italy, Israel,
Netherlands

Address inquiries to:

Marshall Space Flight Center

Attn: Patent Counsel

Mail Code: CC01

Huntsville, AL 35812
U.S.A.

[Corresponding to U.S. Patent No. 3,891,452]

Many coating materials have been developed in the space program. This coating is an excellent thermal coating for exposed surfaces. These coatings have low solar absorptance and a high emittance to provide effective protection from solar radiation, reentry heating, dust, salt spray, etc. The coating of this invention meets these requirements and is easily cleanable and will maintain its physical integrity after severe thermal cycling. It is made up of a high-refractory-content boroaluminum silicate glass frit containing zirconium oxide, lithium fluoride, alkali metal and alkaline earth oxide-flux, zinc oxide and a submicron disperse phase of cubicstabilized zirconium oxide.

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This invention is used as fuel tank sealant. It is composed of a polyimide. This sealant exhibits excellent thermal, oxidative and hydrolytic stability; high tensile strength and elongation during extreme temperature exposures; improved fuel resistance; and lowered glass transition temperature.

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This invention is used as a fuel tank sealant. It is composed of tetracarboxylic acid and dianhydride. This sealant exhibits excellent thermal, oxidative, and hydrolytic stability; high tensile strength and elongation during extreme temperature exposures; improved fuel resistance; and lowered glass transition temperature.

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