Jerome Swartz, Shelley A Harrison, Edward Barkan, Frank Delfine, George Brown: Portable laser scanning arrangement for and method of evaluating and validating bar code symbols. Symbol Technologies, Kirschstein Kirschstein Ottinger & Cobrin, February 17, 1981: US04251798 (291 worldwide citation)

Laser light reflected from a bar code symbol pattern is detected by a photodetector mounted in a portable scanning head of a laser scanning system. By selecting appropriate threshold values on the analog signal generated by the photodetector, the analog signal is converted to a series of pulses, eac ...

Ajay M Madgavkar, Roger F Vogel, Harold E Swift: In situ combustion process for the recovery of liquid carbonaceous fuels from subterranean formations. Gulf Research & Development Company, February 17, 1981: US04250962 (234 worldwide citation)

An integrated in situ combustion process for producing subterranean carbonaceous deposits in which the resulting flue gas of low heating value is combusted over an oxidation catalyst at substoichiometric conditions and is expanded in a gas turbine which drives the air compressor for injecting the co ...

Marvin Gordon: Stabilizing fitting for an intravenous catheter. Whitman Medical Corporation, Holman & Stern, February 17, 1981: US04250880 (187 worldwide citation)

A stabilizing fitting for securely holding an intravenous catheter to a patient's skin at a venipuncture site comprises a laminar base member with an adhesive lower surface and a catheter hub retaining cradle on its upper surface. After insertion of the catheter into a vein and connection to an infu ...

Toshitami Hara, Yasushi Sato, Yasushi Takatori, Yoshiaki Shirato: Liquid jet recording method with variable thermal viscosity modulation. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, February 17, 1981: US04251824 (176 worldwide citation)

A liquid jet recording method, which includes controlling thermal energy quantity to be generated by driving predetermined numbers of heat generating bodies selected in accordance with recording information from a plurality of heat generating bodies which disposed along a flow path in a liquid chamb ...

Edwin L Adair: Wound drainage device. Medical Dynamics, Sheridan Ross Fields & McIntosh, February 17, 1981: US04250882 (168 worldwide citation)

A drainage device for attachment to a portion of the skin of an individual is provided. The device comprises a flange which sealingly engages the skin and has an opening therein to overlie a wound in the skin tissue. A ring member having a channel formed therein is mounted on a side of the flange op ...

Bert Boyson, Terence J Gallagher, William E Porsche: Computer controlled inspector/printer document inspection. The Perkin Elmer Corporation, Salvatore A Giarratana, Francis L Masselle, Edwin T Grimes, February 17, 1981: US04250806 (149 worldwide citation)

A document processor for transporting documents through a path, detecting flaws thereon by electronically scanning each side of the document, printing selectable indicia only on unflawed documents, and sorting and storing separately the flawed and unflawed documents. The electronically scanned infor ...

Stephen C Jacobsen, Jerome C Stenehjem, Robert L Stephen, Richard D Luntz: Non-invasive chemical species delivery apparatus and method. Motion Control, Thorpe North Western & Gold, February 17, 1981: US04250878 (129 worldwide citation)

A bioelectrode for non-invasive and inotophoretic delivery of chemical species (such as ions, polar molecules, etc.) into the skin of a person. The bioelectrode includes a pouch having flexible walls, at least a portion of which is composed of a microporous, permeable or semipermeable membrane. The ...

James B Stolz: Solid state electronic ballast system for fluorescent lamps. Synergetics, Keith D Beecher, February 17, 1981: US04251752 (110 worldwide citation)

An electronic solid state system is provided for starting and operating one or more fluorescent lamps, and which supplies power to the lamps at a relatively high frequency, and at a relatively high power factor. The system includes a circuit which forces the line current to be proportional to the ap ...

Ludwig Bonnet: Endoscopes. Richard Wolf, Kinzer Plyer Dorn & McEachran, February 17, 1981: US04250873 (107 worldwide citation)

This invention relates to endoscopes comprising for inserting an implant liner into an opening through a stricture in the urethra.

Hideto Kakihara, Kenichi Hiratsuka, Yoji Shibata, Wataru Kosuge: Picture/audio signal transmission system. Nippon Telegraph and Telephone Public Corporation, Hitachi, Craig & Antonelli, February 17, 1981: US04251691 (105 worldwide citation)

A center-to-end type information service system utilizing the public telephone networks that are fundamental communication media of nation-wide scale is disclosed in which desired information is requested from the terminal side to the center by means of a telephone set or simplified keyboard and the ...