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Method of producing prepolymers from hydroxyalkyl lignin derivatives
(United States Patent and Trademark Office, 1992-04-07)
A method of producing prepolymeric materials from lignin is disclosed. The method uses lignin which has been hydroxyalkyl modified, such that the lignin is substantially non-phenolic and solvent soluble and/or liquid. The ...
Method and apparatus for sensing strain in a waveguide
(United States Patent and Trademark Office, 1993-02-23)
The present invention pertains to a strain sensor. The strain sensor is comprised of an optical wave guide, a device for providing optical pulses to the optical wave guide and a device for sensing localized strain in the ...
Method of making in-situ whisker reinforced glass ceramic
(United States Patent and Trademark Office, 1993-02-16)
A heat processing procedure is used to create reinforcing whiskers of TiO.sub.2 in glass-ceramic materials in the LAS and MAS family. The heat processing procedure has particular application in creating TiO.sub.2 in-situ ...
Compositions for forming high temperature ceramic particulate filters
(United States Patent and Trademark Office, 1993-10-12)
A high temperature ceramic filter is produced from a composition containing refractory cement, aggregate, pore forming additives, and sintering agents. The pore forming additives are synthetic or organic powders or fibers ...
Active control of aircraft engine inlet noise using compact sound sources and distributed error sensors
(United States Patent and Trademark Office, 1994-10-11)
An active noise control system using a compact sound source is effective to reduce aircraft engine duct noise. The fan noise from a turbofan engine is controlled using an adaptive filtered-x LMS algorithm. Single multi ...
Fine powders of ketone-containing aromatic polymers and process of manufacture
(United States Patent and Trademark Office, 1994-10-18)
Fine particles of semi-crystalline ketone-containing aromatic polymers (PEEK, PEKK, etc.) are produced by controlling the rate and conditions of hydrolysis of an amorphous polyarylketimine intermediate. The choice of acid ...
Fused biconical taper fiber optic coupler station and fabrication techniques
(United States Patent and Trademark Office, 1994-08-16)
The fibers are bound together about 1 cm apart. An oxy-propane torch is used to heat the fibers so that they fuse together. At the same time, the two relatively movable translational stages to which the fibers are clamped ...
Zero-voltage-transition (ZVT) 3-phase PWM voltage link converters
(United States Patent and Trademark Office, 1996-11-12)
An improved zero voltage transition (ZVT) pulse width modulation (PWM) link converter is provided which introduces a space vector modulation scheme and an auxiliary circuit which includes a commutation power supply or ...
Chemical modification of shaped hydrogels in non-aqueous medium
(United States Patent and Trademark Office, 1996-06-25)
A method is described for the chemical modification of pre-shaped hydrogels in non-aqueous medium. The conditions permit the reaction of highly expanded, porous hydrogel particles, such as spherical beads, using pseudo ...
Reduced operator emission exposure antennas for safer hand-held radios and cellular telephones
(United States Patent and Trademark Office, 1996-07-30)
An antenna for a personal communication device designed for reducing RF emissions to a user's head and body comprises a single half-wave dipole antenna element mounted on the top of a telescoping rod such that the antenna ...