American Hospital Supply Corporation

Precision Scientific, Inc.

Clifford C Johnson

Vincent E Eitzen

Peter Juodikis

Theodore Christie

Apparatus for measuring the vapor pressure of a volatile liquid includes one or more cylindrical test chambers immersed in a constant temperature water bath. Each test chamber includes connected liquid and vapor compartments, with the vapor compartment coupled to a pressure transducer and display arrangement. The test chambers are mounted to a movable tray in the constant temperature water bath. An eccentric drive assembly driven by the combination of a motor and gear box is coupled to the tray for linearly displacing the tray and test chambers in a reciprocating manner until a constant pressure is observed on the pressure display.

Apparatus for measuring vapor pressure

An apparatus for use in curing dental restorative materials by means of visible (or ultraviolet) light. High intensity light is transmitted from a light box to the operative site by a fiber-optic cable and a hand-held light wand, the wand having a tip for directing the light towards the polymerizable material at the site of restoration. Proper spacing of the tip from the material to be cured is achieved by a conical shield which also functions to concentrate the light and to immobilize the hand-held wand in relation to the tooth undergoing restoration, without at the same time risking direct contact with and possible marring of the material to be photo-cured. A holder releasably supports the wand until use is required, the holder having a recess for receiving the shielded tip of the wand to protect the patient and others from the dazzling and discomforting effects of misdirected high-intensity light. The fiber-optic cable has its proximal end plugged into one of a plurality of scokets provided by the light box, the other sockets being adapted to receive the plugs of fiber-optic cables extending to other dental instruments capable of being illuminated by light from the same source.

Apparatus for photo-curing of dental restorative materials

Punched cards, used to identify items to be ordered from a central location, are selected and placed in a card reader which is located at the subscriber. Information may also be entered manually by a keyboard. In either case, the information is encoded into tone signals which are transmitted to the central location for recording and verification. When an 'accept' tone signal is returned to the subscriber, indicating that the previously transmitted block of data has been received and found to be acceptable, a card feed signal actuates the card reader to feed the next card. If a 'reject' tone is returned, indicating that the data received was unacceptable, the operator may enter data manually via the keyboard, re-run the card that had not been accepted, or simply skip the rejected card. The system is compatible with existing telephone communication equipment.

Electronic order placement system using signals over telephone line

An electronic system employs a calculator as an arithmetic unit and accumulator. A mode switch enables operation as a timer (decrementing from a preset value) or a stopclock (incrementing time). Initial or preset values of time are entered manually through a keyboard in either mode. Sequencing circuitry controls execution of the arithmetic functions of the calculator in proper order and function, depending on the selected mode. The sequencing circuitry also gates the output of an oscillator to provide time increment pulses. A display unit generates a visual display of the accumulated time in both modes. In the timer mode, sensing circuitry senses when a preset time has elapsed and generates an audible signal.

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Arlington Heights, IL, United States of America

Clifford C Johnson