1
John R Purcell: Superconducting dipole electromagnet. The United States of America represented by the United States Energy Research and Development Administration, Dean E Carlson, Frank H Jackson, Donald P Reynolds, July 26, 1977: US04038622 (35 worldwide citation)

A dipole electromagnet of especial use for bending beams in particle accelerators is wound to have high uniformity of magnetic field across a cross section and to decrease evenly to zero as the ends of the electromagnet are approached by disposing the superconducting filaments of the coil in the cre ...


2
Henry G Blosser, Gabe F Blosser, Emanuel B Jemison, John R Purcell: Vented 360 degree rotatable vessel for containing liquids. Board of Trustees Operating Michigan State University, Ian C McLeod, December 30, 1986: US04633125 (34 worldwide citation)

An apparatus 10 including a valveless rotatable, continuously vented vessel 11 for containing a liquid is described. The vessel can be confined in a vacuum chamber 15 to reduce heat losses from the liquid in the vessel. The apparatus is particularly adapted for containing superconducting coils in a ...


3
John R Purcell, Wilkie Y Chen, Walter E Toffolo: Methods and apparatus for reducing heat introduced into superconducting systems by electrical leads. General Atomic Company, Fitch Even Tabin Flannery & Welsh, January 25, 1983: US04369636 (26 worldwide citation)

Methods and apparatus are provided for minimizing heat introduced by electrical leads into the cryogenic liquid in which a superconducting magnet is immersed. The electrical leads have normal portions extending from exterior of the cryogenic liquid containment vessel and thereinto and superconductin ...


4
Sibley C Burnett, John R Purcell, M Harlan Horner: Magnet system and method of its manufacture. GA Technologies, Fitch Even Tabin & Flannery, September 15, 1987: US04694269 (19 worldwide citation)

A magnet system for providing a localized, substantially homogeneous magnetic field for use in nuclear magnetic resonance imaging. The magnet system includes a vacuum vessel defining a bore for receiving the subject of the imaging. It further includes a cryogenic containment vessel supported within ...


5
Jerry A Selvaggi, John R Purcell: Superconductor high gradient magnetic separator. Eriez Manufacturing Company, Charles L Lovercheck, Wayne L Lovercheck, Dale R Lovercheck, October 27, 1987: US04702825 (17 worldwide citation)

A high gradient magnet is disclosed having a coil of superconducting material immersed in liquid helium in a toroidal shaped liquid helium vessel, supported in axial spaced concentric relation to a toroidal shaped liquid nitrogen vessel which forms one end of a toroidal heat shield made of high heat ...


6
Sibley C Burnett, John R Purcell, Bruce C Breneman, Raymond E Sarwinski: MRI Magnet system with permanently installed power leads. General Atomics, Fitch Even Tabin & Flannery, June 20, 1989: US04841268 (16 worldwide citation)

A magnet system, having permanently installed power leads, for providing a magnetic field. The system includes a vacuum vessel and a cryogenic containment vessel supported within the vacuum vessel. The containment vessel holds a main coil formed of superconductive wire, along with a quantity of liqu ...


7
Wilkie Y Chen, Yen Hwa L Hsu, John R Purcell: Magnet system providing a region of substantially homogeneous field strength. GA Technologies, Fitch Even Tabin & Flannery, April 14, 1987: US04658229 (15 worldwide citation)

A magnet system for providing a substantially homogeneous magnetic field in a region. The magnet system includes a main coil and a pair of correcting coils with the main coil generating a magnetic field in a zone including the region. The correcting coils are at first and second locations in the zon ...


8
Bruce C Breneman, John R Purcell, Sibley C Burnett: MRI magnet system having shield and method of manufacture. GA Technologies, Fitch Even Tabin & Flannery, May 10, 1988: US04743880 (15 worldwide citation)

A magnet system for providing a localized, substantially homogeneous field for use in medical magnetic resonance imaging and its incorporation into a method of siting. The magnet system includes a vacuum vessel defining a bore for receiving the subject of the imaging and having a first end and a sec ...


9
Bruce C Breneman, John R Purcell, Raymond E Sarwinski: Magnetic resonance imaging magnet having minimally symmetric ferromagnetic shield. General Atomics, June 5, 1990: US04931759 (13 worldwide citation)

A magnetic resonance imaging magnet has a solenoidal superconducting winding producing a magnetic field and defining an examination region within a bore thereof. The examination region receives a body to be examined. The solenoidal superconducting winding generates a quasi-static magnetic field for ...


10
John R Purcell, Bruce C Breneman, Sibley C Burnett: MRI magnet system with vessel having composite first wall. General Atomics, Fitch Even Tabin & Flannery, August 30, 1988: US04768008 (13 worldwide citation)

A magnet system for use in magnetic resonance imaging. The system includes a vacuum vessel having a first wall assembly defining a bore for receiving the subject of the imaging and a pair of spaced metallic end plates welded to the ends of the first wall assembly. The system further includes a cryog ...



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