1
Hoffmann Rudolf, Winkler Wolfgang: Joinder of floor tiles. Freudenberg Carl, May 8, 1973: US3731445 (243 worldwide citation)

Floor tiles are joined by cutting away material along the edges so as to leave undercut projections extending downwardly from the bottom of the tiles. Joining of tiles is effected by using a strip provided with a pair of parallel channels into which extend the projections from two different tiles. T ...


2
Zaffaroni Alejandro: Bandage for the controlled metering of topical drugs to the skin. Alza Corporation, May 8, 1973: US3731683 (227 worldwide citation)

Bandage for the topical administration of controlled therapeutically effective quantities of topically active drugs has a backing member, a pressure-sensitive adhesive, and a reservoir layer containing a topically active drug confined within a wall member. The wall member is formed from drug release ...


3
Blackshear Perry J, Dorman Frank D, Blackshear Jr Perry L, Buchwald Henry, Varco Richard L: Implantable indusion pump. The Regents of the University of Minnesota, May 8, 1973: US3731681 (184 worldwide citation)

An implantable pump for infusing drugs or other chemicals or solutions into the body at a uniform slow flow rate. The pump comprises a housing divided into two chambers separated by a bellows, diaphragm or other pressure-communicating interphase. A volatile liquid partially filling one chamber provi ...


4
Wilhelmson Jack L, Weichselbaum Theodore E, Braun Vernon F: Infusion system. Sherwood Medical, May 8, 1973: US3731679 (151 worldwide citation)

A portable infusion system uses a disposable piston type syringe as a positive displacement pump. The syringe piston is reciprocally driven by a bidirectional DC motor under control of a battery powered circuit. Different selectable rates of pumping are maintained by controlling the width of bidirec ...


5
Fergason James L: Display devices utilizing liquid crystal light modulation. International Liquid Xtal Company, May 8, 1973: US3731986 (122 worldwide citation)

Optical display devices for converting electrical intelligence into optical images with the use of a shutter device comprising a layer of liquid crystal material sandwiched between opposing parallel plates coated with transparent conducting films. These plates, with the liquid crystal material there ...


6
Pond Raymond B: Electrically actuated lock mechanism. May 8, 1973: US3731963 (91 worldwide citation)

A locking mechanism includes a tubular sleeve adapted to receive a shouldered projection extending from the closure member, a spring biased plunger normally projecting into the projection seat to engage the projection. A solenoid is associated with the plunger for retracting the plunger from the tub ...


7
Loe James M: Corporeal fluid control using bistable magnetic duct valve. Pressman David Roy, May 8, 1973: US3731670 (84 worldwide citation)

A binary duct valve comprising a tubular housing containing a magnetically sensitive closure member (e.g., a spheroid) small enough to move freely in said housing, and a pair of magnetized valve seats positioned at the respective ends of said housing, one seat having an aperture therethrough which i ...


8
Nuzzo Gary J: Apparatus for producing concrete blocks with undercut portions. May 8, 1973: US3731899 (78 worldwide citation)

Apparatus for forming a concrete block having the usual block with two cavities connected to a small facing block or slab by web portions spaced from the top and bottom of the block and slab, comprises the usual mold box with cores for the block cavities and spaces between the block and slab. Core p ...


9
Obland Donald R: Computer-controlled article merchandising system for prescription drugs and like articles. May 8, 1973: US3732544 (74 worldwide citation)

An automatic merchandising system for prepackaged articles such as prescription drugs. The drugs are stored in individual prepackaged units on a continuous strip which is wound on a reel in an individual dispenser unit for each type of drug. An information input device, preferably a typewriter input ...


10
Townsend Ray T: Treadmill exercising device. May 8, 1973: US3731917 (69 worldwide citation)

A treadmill exercising device comprising first and second spaced apart rollers mounted on a frame so that they are each rotatable with respect to a horizontal axis. An endless belt extends around and between the rollers and includes an upper walking belt portion which slides upon a smooth, highly po ...



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