1
Morrison Jr Charles F: Switching means for an electro-surgical device including particular contact means and particular printed-circuit mounting means. Valleylab, Burton Crandell & Polumbus, April 2, 1974: US3801766 (314 worldwide citation)

An electrical switching device is disclosed herein and comprises the major components suitable for use as a compact, easily installed switching device and also in an electro-surgical tool which, through the operation of the switching device, is readily adaptable for different intended uses and highl ...


2
White Norman S: Antral catheter for reduction of fractures. Dennison Dennison Townshend & Meserole, April 2, 1974: US3800788 (267 worldwide citation)

An inflatable catheter for insertion into the maxillary sinus cavity via the nasal opening, which when inflated with sterile water or air will exert pressure on the bone surrounding the sinus and will move intruding bone portions such as may be present upon fracture of the maxilla or other bones to ...


3
Berry Fred M, Shirley James N, Lipsky Eugene C: Short-wave therapy apparatus. International Medical Electronics, Lowe Kokjer Kircher Wharton & Bowman, April 2, 1974: US3800802 (141 worldwide citation)

A short wave therapy apparatus has two treatment heads enabling an operator to treat two separate areas of a patient at one time or to treat two patients simultaneously. The circuit includes a crystal oscillator, a pulse modulator, an RF buffer, an RF power amplifier and a 'pi' network which precede ...


4
Newton David W: Isolating switching circuit for an electrosurgical generator. Valleylab, Burton Crandell & Polumbus, April 2, 1974: US3801800 (137 worldwide citation)

An isolating switching circuit suitable for use in an electrosurgical generator to transmit mode information from an electrosurgical instrument to an electrosurgical power generator is disclosed. A selected light emitting diode is energized in accordance with the setting of a mode of operation switc ...


5
Larson Rodney L, Petersen Niel R: Multiple axis control system for vibration test apparatus. MTS Systems Corporation, Dugger Johnson & Westman, April 2, 1974: US3800588 (132 worldwide citation)

Four vertically disposed hydraulic actuators act at spaced drive points on the underside of a rigid structure so as to impart vibratory motion thereto. The system herein disclosed takes signals representing displacement and load, and provides individual control signals for each actuator so that the ...


6
McKnight James J, Guldalian Jr Jack: Laminated collagen film dressing. Johnson & Johnson, Sherman Herbert I, April 2, 1974: US3800792 (127 worldwide citation)

A surgical dressing that is particularly useful for the treatment of burn wounds is disclosed made from a thicker layer of a collagen compressed foam film to which has been laminated, without any adhesive, a thin continuous layer of an inert polymer material, such as polyurethane, having a moisture ...


7
Trenary John M, Smith David W: Spray nozzle. Teledyne, Drake Hugh H, April 2, 1974: US3801019 (122 worldwide citation)

A spray nozzle or showerhead is operable to selectively discharge a continuous spray, a cyclically interrupted pulsating spray of adjustable frequency of pulsation or a combination of the two sprays in which the proportion of the pulsating spray to continuous spray may be controllably varied. The no ...


8
Acker Norbert Karl: Method and apparatus for identifying objects. Scanner, Smyth Roston & Pavitt, April 2, 1974: US3801775 (122 worldwide citation)

Method and apparatus for identifying objects by means of data information which may appear in random position and orientation and at random times in a particular area. A data field of particular orientation is provided to such an object, the data field including contrasting data markings arranged in ...


9
White Anderson D, Wisler Allen E: Hardfacing compositions and gage hardfacing on rolling cutter rock bits. Hughes Tool Company, April 2, 1974: US3800891 (120 worldwide citation)

The novel hardfacing compositions are sintered tungsten carbide granules in an alloy steel matrix, the granules consisting of grains of monotungsten carbide cemented together with a number of novel binders - iron, nickel, alloys of the three iron group metals and metallic alloys including at least o ...


10
Schrenk Walter J, Chisholm Douglas S, Cleereman Kenneth J, Alfrey Jr Turner: Multilayer plastic articles. The Dow Chemical Company, Ingraham Robert B, April 2, 1974: US3801429 (118 worldwide citation)

Multiple layer films are made by arranging a minimum of two streams into one stream having a plurality of generally parallel layers. By mechanically manipulating the layered stream an increased number of layers are obtained and the manipulating stream is shaped into a desired configuration having a ...