Inventor · disambiguated record
Ralph C. Longsworth
Also filed as: CHALMERS MATTHEW G · LONGSWORTH RALPH · LONGSWORTH RALPH C
73 granted patents·9 pending applications·1,590 citations·filing 1977–2023
99Inventor score
Files withSUMITOMO SHI CRYOGENICS OF AMERICA INC20AIR PROD & CHEM16APD CRYOGENICS INC14SUMITOMO HEAVY INDUSTRIES7LONGSWORTH RALPH6
Top patents by PatentIndex Score
82 records- 0196US4279127ARemovable refrigerator for maintaining liquefied gas inventoryAIR PROD & CHEM·Filed 1980·Granted Jul 21, 1981·77 cites·5 claims
- 0295US4781033AHeat exchanger for a fast cooldown cryostatAPD CRYOGENICS·Filed 1987·Granted Nov 1, 1988·80 cites·16 claims
- 0395US4277949ACryostat with serviceable refrigeratorAIR PROD & CHEM·Filed 1979·Granted Jul 14, 1981·69 cites·11 claims
- 0494US8448461B2Fast cool down cryogenic refrigeratorLONGSWORTH RALPH·Filed 2011·Granted May 28, 2013·13 cites·21 claims
- 0593US4223540ADewar and removable refrigerator for maintaining liquefied gas inventoryAIR PROD & CHEM·Filed 1979·Granted Sep 23, 1980·56 cites·10 claims
- 0692US10753653B2Heat station for cooling a circulating cryogenSUMITOMO (SHI) CRYOGENICS OF AMERICA INC·Filed 2018·Granted Aug 25, 2020·3 cites·12 claims
- 0791US6256997B1Reduced vibration cooling device having pneumatically-driven GM type displacerINTERMAGNETICS GENERAL CORP·Filed 2000·Granted Jul 10, 2001·56 cites·13 claims
- 0891US5337572ACryogenic refrigerator with single stage compressorAPD CRYOGENICS INC·Filed 1993·Granted Aug 16, 1994·76 cites·16 claims
- 0990US5461873AMeans and apparatus for convectively cooling a superconducting magnetAPD CRYOGENICS INC·Filed 1993·Granted Oct 31, 1995·73 cites·34 claims
- 1087US6629418B1Two-stage inter-phasing pulse tube refrigerators with and without shared buffer volumesSHI APD CRYOGENICS INC·Filed 2002·Granted Oct 7, 2003·46 cites·11 claims
- 1186US9080794B2Gas balanced cryogenic expansion engineLONGSWORTH RALPH·Filed 2011·Granted Jul 14, 2015·6 cites·13 claims
- 1285US5586437AMRI cryostat cooled by open and closed cycle refrigeration systemsINTERMAGNETICS GENERAL CORP·Filed 1995·Granted Dec 24, 1996·71 cites·22 claims
- 1385US5452582ACryo-probeAPD CRYOGENICS INC·Filed 1994·Granted Sep 26, 1995·321 cites·14 claims
- 1484US10634393B2Cryogenic expander with collar bumper for reduced noise and vibration characteristicsSUMITOMO SHI CRYOGENICS OF AMERICA INC·Filed 2017·Granted Apr 28, 2020·2 cites·14 claims
- 1584US9546647B2Gas balanced brayton cycle cold water vapor cryopumpLONGSWORTH RALPH·Filed 2012·Granted Jan 17, 2017·5 cites·13 claims
- 1684US8978400B2Air cooled helium compressorDUNN STEPHEN·Filed 2010·Granted Mar 17, 2015·8 cites·11 claims
- 1784US7631505B2Wearless valve for cryorefrigeratorSUMITOMO HEAVY INDUSTRIES·Filed 2005·Granted Dec 15, 2009·13 cites·5 claims
- 1883US7497084B2Co-axial multi-stage pulse tube for helium recondensationSUMITOMO HEAVY INDUSTRIES·Filed 2005·Granted Mar 3, 2009·7 cites·13 claims
- 1983US4150549ACryopumping method and apparatusAIR PROD & CHEM·Filed 1977·Granted Apr 24, 1979·32 cites·5 claims
- 2082US12018780B2Split pulse tube connecting lineSUMITOMO SHI CRYOGENICS OF AMERICA INC·Filed 2021·Granted Jun 25, 2024·1 cites·8 claims
- 2181US4785879AParallel wrapped tube heat exchangerAPD CRYOGENICS·Filed 1987·Granted Nov 22, 1988·40 cites·7 claims
- 2279US10704809B2System for warming-up and cooling-down a superconducting magnetSUMITOMO SHI CRYOGENICS OF AMERICA INC·Filed 2016·Granted Jul 7, 2020·5 cites·8 claims
- 2378US6715300B2Pulse tube integral flow smootherIGC APD CRYOGENICS·Filed 2001·Granted Apr 6, 2004·29 cites·39 claims
- 2478US6488120B1Fail-safe oil lubricated helium compressor unit with oil-free gas deliverySHI APD CRYOGENICS INC·Filed 2000·Granted Dec 3, 2002·22 cites·12 claims
- 2576US8776534B2Gas balanced cryogenic expansion engineDUNN STEPHEN·Filed 2011·Granted Jul 15, 2014·5 cites·13 claims
- 2674US4277951ACryopumping apparatusAIR PROD & CHEM·Filed 1980·Granted Jul 14, 1981·24 cites·10 claims
- 2772US8418479B2Co-axial multi-stage pulse tube for helium recondensationXU MINGYAO·Filed 2009·Granted Apr 16, 2013·3 cites·10 claims
- 2871US11649989B2Heat station for cooling a circulating cryogenSUMITOMO SHI CRYOGENICS OF AMERICA INC·Filed 2020·Granted May 16, 2023·0 cites·2 claims
- 2971US9186601B2Cryopump drain and ventLONGSWORTH RALPH·Filed 2012·Granted Nov 17, 2015·2 cites·5 claims
- 3071US7997088B2Hybrid spool valve for multi-port pulse tubeSUMITOMO HEAVY INDUSTRIES·Filed 2005·Granted Aug 16, 2011·3 cites·8 claims
- 3170US5687574AThrottle cycle cryopumping system for Group I gasesAPD CRYOGENICS INC·Filed 1996·Granted Nov 18, 1997·34 cites·18 claims
- 3270US4484458AApparatus for condensing liquid cryogen boil-offAIR PROD & CHEM·Filed 1983·Granted Nov 27, 1984·28 cites·8 claims
- 3369US9897350B2MRI cool down apparatusSUMITOMO SHI CRYOGENICS OF AMERICA INC·Filed 2014·Granted Feb 20, 2018·1 cites·8 claims
- 3469US8187370B2Horizontal bulk oil separatorDUNN STEPHEN B·Filed 2006·Granted May 29, 2012·5 cites·15 claims
- 3568US5595065AClosed cycle cryogenic refrigeration system with automatic variable flow area throttling deviceAPD CRYOGENICS·Filed 1995·Granted Jan 21, 1997·38 cites·40 claims
- 3667US11604010B2Co-axtal, double-inlet valve for pulse tube cryocoolerSUMITOMO SHI CRYOGENICS OF AMERICA INC·Filed 2021·Granted Mar 14, 2023·0 cites·17 claims
- 3767US2022003462A1Dual helium compressorsSUMITOMO SHI CRYOGENICS OF AMERICA INC·Filed 2021·Application pending·0 cites
- 3866US5579654ACryostat refrigeration system using mixed refrigerants in a closed vapor compression cycle having a fixed flow restrictorAPD CRYOGENICS INC·Filed 1995·Granted Dec 3, 1996·43 cites·22 claims
- 3966US4430863AApparatus and method for increasing the speed of a displacer-expander refrigeratorAIR PROD & CHEM·Filed 1982·Granted Feb 14, 1984·19 cites·3 claims
- 4065US4593530AMethod and apparatus for improving the sensitivity of a leak detector utilizing a cryopumpAIR PROD & CHEM·Filed 1984·Granted Jun 10, 1986·20 cites·20 claims
- 4163USRE49384EHelium compressor with dual after-coolersSUMITOMO SHI CRYOGENICS OF AMERICA INC·Filed 2021·Granted Jan 24, 2023·0 cites·7 claims
- 4262US4606201ADual thermal couplingAIR PROD & CHEM·Filed 1985·Granted Aug 19, 1986·27 cites·20 claims
- 4361US4514204ABakeable cryopumpAIR PROD & CHEM·Filed 1983·Granted Apr 30, 1985·17 cites·14 claims
- 4461US4152903ABimaterial demand flow cryostatAIR PROD & CHEM·Filed 1978·Granted May 8, 1979·20 cites·16 claims
- 4560US4283948ACryogenic air samplerAIR PROD & CHEM·Filed 1979·Granted Aug 18, 1981·14 cites·5 claims
- 4659US9581360B2Gas balanced cryogenic expansion engineSUMITOMO (SHI) CRYOGENICS OF AMERICA INC·Filed 2014·Granted Feb 28, 2017·0 cites·5 claims
- 4759US2023288029A1System for capturing vapor from a cryogenic storage tankSUMITOMO SHI CRYOGENICS OF AMERICA INC·Filed 2023·Application pending·0 cites
- 4858US4219588AMethod for coating cryopumping apparatusAIR PROD & CHEM·Filed 1979·Granted Aug 26, 1980·12 cites·3 claims
- 4957US11662123B2Reversible pneumatic drive expanderSUMITOMO SHI CRYOGENICS OF AMERICA INC·Filed 2021·Granted May 30, 2023·0 cites·14 claims
- 5057US6554103B2Fail-safe oil lubricated helium compressor unit with oil-free gas deliverySHI APD CRYOGENICS INC·Filed 2002·Granted Apr 29, 2003·4 cites·6 claims
Showing the top 50 of 82 patent records by PatentIndex Score.
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