1
Robert L Nichols: Shut off valve for medical suction apparatus. Richards Harris & Medlock, March 17, 1981: US04256109 (487 worldwide citation)

The specification discloses an improved shut off valve for a canister and lid assembly used as part of a medical suction apparatus. The valve includes a cylindrical plunger made of a soft rubber-like material and having an upwardly facing concave disc integrally formed on the top of the plunger. Whe ...


2
Felix Theeuwes: Microporous-semipermeable laminated osmotic system. Alza Corporation, Paul L Sabatine, Thomas E Ciotti, Edward L Mandell, March 17, 1981: US04256108 (450 worldwide citation)

An osmotic therapeutic system for delivering a drug is disclosed. The system comprises a drug delivery module which module comprises a rate controlling laminated wall surrounding a reservoir and has a portal for delivering drug from the system. The laminated wall comprises a semipermeable lamina in ...


3
Philip S Carter, John F Krumme: Alternating current electrically resistive heating element having intrinsic temperature control. Iris Associates, C Michael Zimmerman, March 17, 1981: US04256945 (393 worldwide citation)

The heating element consists of a substrate or core of a non-magnetic material having high thermal and electrical conductivity, clad with a surface layer of a ferromagnetic material of relatively low electrical conductivity. When the heating element is energized by a source of high frequency alterna ...


4
James L Thorneburg: Athletic socks with integrally knit arch cushion. Bell Seltzer Park & Gibson, March 17, 1981: US04255949 (169 worldwide citation)

The present athletic socks are particularly suitable for jogging and running and are provided with shock absorber cushion pads (C) in the inner portions (16a, 36a) of the arch areas (16, 36) and being formed by a sufficiently greater amount of yarn being knit in the inner arch portions (16a, 36a) th ...


5
Slobodan M Cuk: DC-to-DC switching converter with zero input and output current ripple and integrated magnetics circuits. California Institute of Technology, Freilich Hornbaker Wasserman Rosen & Fernandez, March 17, 1981: US04257087 (167 worldwide citation)

An improved dc-to-dc converter is provided comprised of two inductances, an input inductance in series with the input source and an output inductance in series with the load, and between the two inductances, two storage capacitances in series with the two inductances. Switching means alternately con ...


6
J David Kopf, William Seiler Jr, Gerald S Palecki, Howard H Kaufman: Head positioner. David Kopf Instruments, Bruce H Johnsonbaugh, March 17, 1981: US04256112 (167 worldwide citation)

A head positioner for radiologic and other medical procedures and a method for forming the head positioner are disclosed. A plastic rear component engages the backside of the patient's head, left and right plastic components engage each auditory meatus of the patient and a front component engages th ...


7
Michael Bilitch: Leadless cardiac pacer. American Technology, Vernon D Beehler, March 17, 1981: US04256115 (159 worldwide citation)

A leadless battery operated cardiac pacemaker is embodied in a small disc-like case for attachment beneath the pericardium directly to the heart muscle. One electric lead is curled and serves also as a means for both physically and electrically attaching the case to the heart muscle. The other lead ...


8
John P Kapp, James T Robertson, Elton M Tucker: Arterial pressure control system. Cesari and McKenna, March 17, 1981: US04256094 (153 worldwide citation)

An arterial pressure control system comprises an inflatable cuff for encircling the artery and a fluid pump connected to inflate the cuff. The outlet pressure of the pump is controlled by a programmable controller which receives a feedback signal from a pressure sensor contacting the artery downstea ...


9
Christopher H Reynolds: Display device. Abbott Spear, March 17, 1981: US04257084 (143 worldwide citation)

A light-projection device for digital instrumentation consists of a one-piece body including reflective and diffusive surfaces and a chamber to locate a plurality of sources of varicolored light. Light from the sources is diffused to fill an entire line segment of the seven in a typical digit, with ...


10
James Nadir: System bus arbitration, circuitry and methodology. Intel Corporation, Blakely Sokoloff Taylor & Zafman, March 17, 1981: US04257095 (142 worldwide citation)

Arbitration of a system bus shared by a plurality of digital processors, input and output devices and memories may be shared in an intelligent and efficient manner by using an arbitration method and an arbiter and bus controller circuit which allows a lower priority processor or user to access the s ...