1
William J O Neill: Removable hemostasis valve. Argon Medical, Lawrence S Levinson, Sanford J Asman, March 13, 1984: US04436519 (267 worldwide citation)

A hemostasis valve comprising a body having a central passage, a seal having a central aperature therein, the seal being mounted in the central passage, and a diaphragm having a wall member with a slit therein, the diaphragm being mounted in the central passage, the diaphragm wall member having an i ...


2
David C Auth: Transluminal thrombectomy apparatus. E R Squibb & Sons, Lawrence S Levinson, Sanford J Asman, March 3, 1987: US04646736 (225 worldwide citation)

The invention is an apparatus for breaking up a thrombus by introducing a rotating drive shaft into the thrombus whereby the fibrin of the thrombus will be withdrawn from the thrombus onto the rotating drive shaft, thereby breaking up the network of the thrombus which prevents blood flow. The appara ...


3
Donald W Rouse, Lawrence B Horwitz, E Thomas Wiggins: Distribution energy management system. Sangamo Weston, Sanford J Asman, February 14, 1989: US04804938 (183 worldwide citation)

A bidirectional data communications distribution network is established between the system operations center (SOC) and customer terminals of a load management and electrical energy distribution system. The distribution network comprises independent processor controlled, primary communications interf ...


4
Simon Barakat: Method and system for suthenticating electronic memory cards. Schlumberger, Sanford J Asman, March 20, 1990: US04910774 (166 worldwide citation)

The method in suitable for authenticating electronic memory cards intended for authorizing the supply of goods or services after being processed by a card reader machine. The card memory includes at least three zones (Z.sub.1, Z.sub.2, Z.sub.3) comprising a first zone (Z.sub.1) which is readable fro ...


5
Eric Laporte: Adaptive network routing for power line communications. Schlumberger, Sanford J Asman, July 16, 1991: US05032833 (130 worldwide citation)

Optimum routing for communications between a central control unit (CCU) and remote units (nodes), such as electricity meters, distributed on an electrical power line is established by broadcasting from the CCU an interrogation signal to be received by the remote units. In response to a receipt of th ...


6
Murray C Carney: Apparatus and method for sensing tampering with a utility meter. Schlumberger, Sanford J Asman, December 5, 1995: US05473322 (127 worldwide citation)

A device for detecting tampering of a utility meter includes sensors to detect a positional displacement of the meter and loss of power to the meter. On sensing a positional displacement of the meter, indicative of an attempt to remove the meter, a timer is activated to enable sensing a power loss t ...


7
William N Waggener Sr, John P Keal: Secure communication system for multiple remote units. Fairchild Weston Systems, Sanford J Asman, May 9, 1989: US04829540 (115 worldwide citation)

A frequency-hopping datalink and providing communication between a base station, relay unit and multiple remote units utilizes time-division multiplexing and transmits information signals containing information relevant to the next frequencies of transmission. Signals from the base station are trans ...


8
Dwayne H Putzke: Fully wetted mechanical ultrasound scanhead. Advanced Technology Laboratories, Lawrence S Levinson, Sanford J Asman, February 4, 1986: US04567895 (111 worldwide citation)

A fully wetted ultrasound scanhead for medical applications is described in which the motor and the rotor are enclosed within a sealed housing filled with ultrasound coupling fluid. The invention includes a drive belt to drive the rotor from the motor, rather than a precision drive means. Speed adju ...


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David J Clarke, Edward A Martin: Transponder with reply frequency derived from frequency of received interrogation signal. Schlumberger, Sanford J Asman, October 11, 1994: US05355513 (96 worldwide citation)

A transponder includes a receiver for receiving a radio interrogation signal. The transponder also includes a phase locked loop decoder for deriving a reference signal from the received interrogation signal, and a radio transmitter for transmitting a transponder reply signal. The phase locked loop h ...