1
Harry M O Sullivan: Portable hybrid communication system and methods. Spectrum Information Technologies, Sixbey Friedman Leedom & Ferguson, November 20, 1990: US04972457 (408 worldwide citation)

A laptop device includes a personal computer, a cellular transceiver, a speakerphone, and a hybrid communications control unit. The device has connectors for attaching a headset, cellular control unit, land telephone line, and additional speakers and microphones. The microprocessor-controlled hybrid ...


2
Gary Gross, James Dale: Encoding system. November 20, 1990: US04972471 (334 worldwide citation)

The method of encoding a given recorded signal made up of a host of different frequencies comprises modifying the recorded signal to selectively alter in a known manner a portion of the recorded signal to produce a machine recognizable start code which is generally unperceptible to human recognition ...


3
James N Daniel Jr, Thomas F Busyn, Brent T Batterman: Marketing research system and method for obtaining retail data on a real time basis. A C Nielsen Company, Mason Kolehmainen Rathburn & Wyss, November 20, 1990: US04972504 (309 worldwide citation)

A market research retail sales data collection system and method includes a plurality of cooperating retail stores, each having an in-store device for automatically collecting processing and storing market research data in a substantially totally passive or non-invasive manner with respect to the on ...


4
Gunther Theile, Gerhard Stoll, Martin Link: Method of transmitting or storing masked sub-band coded audio signals. Bayerische Rundfunkwerbung, Spencer & Frank, November 20, 1990: US04972484 (260 worldwide citation)

In the transmission of audio signals, the audio signal is digitally represented by use of quadrature mirror filtering in the form a plurality of spectral sub-band signals. The quantizing of the sample values in the sub-bands, e.g. 24 sub-bands, is controlled to the extent that the quantizing noise l ...


5
Norman R Toffolon: Pneumatic cushion and seal. Daniel H Kane, November 20, 1990: US04971051 (247 worldwide citation)

A face mask having a perimeter for sealing against the face of a user is incorporated in a continuous positive airway pressure mask (CPAP) for treatment of central and obstructive sleep disorders. An elongate flexible pneumatic cushion seal is formed around the perimeter of the mask. An air passagew ...


6
Gordon T Brown, Richard H Scherer: Order entry and inventory control method. Iron City Sash & Door Company, Walter J Blenko Jr, David V Radack, November 20, 1990: US04972318 (224 worldwide citation)

A method of order entry, product selection and inventory control for building products, building product accessories and building product components sold by a dealer to a customer. The method comprises the steps of providing a computer having a display screen and a plurality of files. A first file l ...


7
Ralph Sklarew: Handwritten keyboardless entry computer system. Grid Systems Corporation, Townsend & Townsend, November 20, 1990: US04972496 (224 worldwide citation)

A keyboardless entry computer system includes a transparent input screen that generates positional information when contacted by a stylus, and a display screen mounted physically below the input screen such that a character that is displayed can be seen below the input screen. The system includes a ...


8
Britton Chance: Phase modulated spectrophotometry. Nim, Woodcock Washburn Kurtz Mackiewicz & Norris, November 20, 1990: US04972331 (217 worldwide citation)

The present invention to provides methods and apparatus for studying photon migration using signal modulation techniques such as time, frequency and phase modulation. The photon migration data may then be converted, using the principles of time-resolved spectroscopy, to determine the concentration o ...


9
Steven Farago: Programmable connector. Israel Nissenbaum, November 20, 1990: US04972470 (194 worldwide citation)

A configurable connector between two or more devices with at least one of the devices being capable of programming the connector through an interface therewith. The connector contains programmable electronic circuitry capable of being instructed by the device whereby the connector assumes a desired ...


10
Robert L Nathans: Counterfeit proof ID card having a scrambled facial image. Robert Nathans, November 20, 1990: US04972476 (193 worldwide citation)

A scrambled facial image of an ID card bearer is recorded upon a card and is descrambled only by using the proper descrambling control code assigned to the proper bearer upon verification of the authenticity of the bearer. The pixel scrambling method prevents card duplication, as a reproduced card w ...