Howard C Welborn Jr: Silicon-bridged transition metal compounds. Exxon Chemical Patents, M B Kurtzman, May 21, 1991: US05017714 (307 worldwide citation)

Silicon-bridged transition metal compounds and their use as .alpha.-olefin polymerization catalysts are disclosed. A chiral silicon-bridged metallocene catalyst polymerizes .alpha.-olefins to high isotacity with a minimum of inversions at high rates of catalyst activity. The catalyst is easily made ...

Dominique Baude, Pierre Chavel, Denis Joyeux, Jean Taboury: Optical lens for correcting astigmatism. Essilor International Compagnie Generale, Blakely Sokoloff Taylor & Zafman, May 21, 1991: US05016977 (216 worldwide citation)

The present invention relates to an optical lens for correcting astigmatism. It includes diffractive components whose outlines are delimited by conic section curves having non-degenerate centers. More precisely, in accordance with the invention, the lens includes adjacent diffractive components havi ...

Yasushi Ueno: Rearview mirror with operating condition display. Schwartz & Weinrieb, May 21, 1991: US05016996 (216 worldwide citation)

A rearview mirror having an operating condition display which is positioned in the forward part of a driver's cabin and is disposed interiorly of the vehicle, the improved rearview mirror having an operating condition display comprises a speed display light which is provided so as to selectively ill ...

Jacob Krippelz Sr: Emergency light. May 21, 1991: US05017903 (216 worldwide citation)

A warning light is contained in the housing of a rear view mirror assembly mounted to the side of a vehicle and directs a conical beam of light toward the pavement at the side of the vehicle.

Geir Tandberg: Combination drill bit. Geir Tandberg, Arild Rodland, Cushman Darby & Cushman, May 21, 1991: US05016718 (212 worldwide citation)

A drill bit for drilling a hole in the ground, with cutting elements annularly cutting a core which, when it has reached a certain height, is continuously crushed by teeth on rolling cones. By combining these two processes, cutting and crushing, in this manner an improved drilling advancement is ach ...

Minoru Sasaki, Masafumi Umeda, Yoshitomo Tagami, Akihiko Sugikawa: Electronic still camera and image recording method thereof. Kabushiki Kaisha Toshiba, Oblon Spivak McClelland Maier & Neustadt, May 21, 1991: US05018017 (202 worldwide citation)

An electronic still camera has a memory card, which is detachably provided, for recording photographed image data. The electronic still camera comprises a data compression unit for compressing image data to be recorded, a mode selection unit provided in association with the data compression unit to ...

George S Allen: Method and apparatus for imaging the anatomy. Kenyon & Kenyon, May 21, 1991: US05016639 (189 worldwide citation)

The present invention pertains to a fiducial implant for the human body that is detectable by an imaging system. The invention is comprised of a first portion and a second portion. The first portion is configured to be detected by an imaging system when placed beneath the skin. The second portion is ...

Fujio Miura: Orthodontic archwire. GAC International, Kenyon & Kenyon, May 21, 1991: US05017133 (184 worldwide citation)

An orthodontic shape-memory alloy archwire for ligating to orthodontic appliances is heat treated, so that different sections of the archwire each exhibit a predetermined modulus of elasticity, and therefore impart a predetermined range of force when deflected. The distal ends of the archwire are fu ...

Jay A Crews: Ergonomically designed keyboard. Daniel C McKown, May 21, 1991: US05017030 (180 worldwide citation)

A keyboard usable on a typewriter or a computer terminal and configured in accordance with ergonomic principles uses chording of one thumb and one finger to type the characters of the English alphabet. The keyboard includes right and left preloaded palm pads which are shaped and contoured to fit the ...

Masatoshi Yasunaga, Masanobu Kohara: Lead frame and semiconductor device. Mitsubishi Denki Kabushiki Kaisha, Leydig Voit & Mayer, May 21, 1991: US05018003 (178 worldwide citation)

A lead frame includes a die pad for mounting thereon a semiconductor chip having a plurality of electrodes, a plurality of leads for electrical connection with the plurality of electrodes of the semiconductor chip, an outer frame disposed on the periphery of the die pad for supporting the die pad an ...