David H Gelfand, Susanne Stoffel, Frances C Lawyer, Randall K Saiki: Purified thermostable enzyme. Cetus Corporation, Janet E Hasak, Kevin R Kaster, Albert P Halluin, December 26, 1989: US04889818 (435 worldwide citation)

A purified thermostable enzyme is obtained that has unique characteristics. Preferably the enzyme is isolated from the Thermus aquaticus species and has a molecular weight of about 86,000-90,000 daltons. The thermostable enzyme may be native or recombinant and may be used in a temperature-cycling ch ...

Nigel Seth Smith, Cameron Bates, Samson Lim, William van Rassel, Robert Yoneda, Keith Lucas: Communications format for a subscription television system permitting transmission of individual text messages to subscribers. Scientific Atlanta, Banner Birch McKie & Beckett, December 26, 1989: US04890321 (368 worldwide citation)

A subscription television system in which individual decoders are enabled to receive individually addressed messages is disclosed. The composite signal, including video and teletext, also comprises addressed packets which are detected by decoders and which indicate that a message addressed to a part ...

Charles W Jaeger, Donald R Titterington, Hu P Le, Jeffrey J Sopko: Phase change ink composition and phase change ink produced therefrom. Tektronix, John D Winkelman, Jerome S Marger, December 26, 1989: US04889560 (293 worldwide citation)

A phase change ink carrier composition is combined with a compatible colorant to form a phase change ink composition of this invention. A thin film of substantially uniform thickness of that phase change ink carrier composition, and the ink produced therefrom, has a high degree of lightness and chro ...

H Vincent Monslow, Steven R Dickey: Television broadcast system for selective transmission of viewer-chosen programs at viewer-requested times. Steven R Dickey, December 26, 1989: US04890320 (289 worldwide citation)

A televsion broadcast system using land lines is provided for real-time transmission of a viewer-chosen program at a viewer requested time to the requesting viewer's television receiver. The preferred method includes the steps of providing a collection of stored programs, communicating the requestin ...

Donald R Titterington, Jeffrey J Anderson, James D Rise, Wayne Jaeger: Substrates having a light-transmissive phase change ink printed thereon and methods for producing same. Tektronix, Jerome S Marger, John D Winkelman, Robert S Hulse, December 26, 1989: US04889761 (258 worldwide citation)

A method for producing a light-transmissive phase change ink printed substrate is described which comprises providing a substrate, and then printing on at least one surface of the substrate a predetermined pattern of a light-transmissive phase change ink which initially transmits light in a non-rect ...

Joel Quaid: Method for making open-cell, silicone-elastomer medical implant. Medical Products Development, Michael G Petit, December 26, 1989: US04889744 (256 worldwide citation)

A medical implant with an external surface layer of silicone elastomer and having an open-cell structure is made by applying solid particles to the external surface layer of the implant before it is cured, curing the external surface layer with the solid particles embedded therein and then dissolvin ...

John Fuller, Joseph A Gasan: Rotary drill bit for use in drilling holes in subsurface earth formations. Reed Tool, Browning Bushman Zamecki & Anderson, December 26, 1989: US04889017 (228 worldwide citation)

A rotary drill bit for use in drilling holes in subsurface earth formations comprises a bit body having a shank at one end for connection to a drill string and an operating end face at the other end. A plurality of first cutting structures, each comprising a preform cutting element, is mounted in th ...

Jean Frederic Clerc, Jean Claude Deutsch, Pierre Vaudaine, Sylvie Vey: Liquid crystal cell using the electrically controlled birefringence effect and a uniaxial medium of negative optical anisotropy usable therein. Commissariat A l Energie Atomique, James E Nilles, Donald C McGaughey, December 26, 1989: US04889412 (225 worldwide citation)

Liquid crystal cell using the electrically controlled birefringence effect and processes for the production of the cell and a uniaxial medium or material of negative optical anistropy usable therein.

Elizabeth A Rauscher, William L Van Bise: Non-invasive method and apparatus for modulating brain signals through an external magnetic or electric field to reduce pain. Magtech Laboratories, Thomas I Rozsa, December 26, 1989: US04889526 (206 worldwide citation)

This invention incorporates the discovery of new principles which utilize magnetic and electric fields generated by time varying square wave currents of precise repetition, width, shape and magnitude to move through coils and cutaneously applied conductive electrodes in order to stimulate the nervou ...

Hans Haindl: Needle. B Braun Melsungen, Spensley Horn Jubas & Lubitz, December 26, 1989: US04889529 (201 worldwide citation)

One side wall of a rigid needle tube is provided at its front end with a curved bending directed towards the opposite, axial side wall and has a lumen opening formed therein. The lumen opening is provided with a rear inner cutting edge and a front punctuating portion which comprises a lancet-shaped ...