Ralph C Longsworth, 90Allentown, PA
Ralph Longsworth Phones & Addresses
Allentown, PA
Bar Harbor, ME
3 Narrows Rd, Mount Desert, ME 04660 207-2445374
2521 Green Acres Dr, Allentown, PA 18103 610-4322284
Work
Position:
Professional/Technical
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Mentions for Ralph C Longsworth
Publications & IP owners
Us Patents
Fail-Safe Oil Lubricated Helium Compressor Unit With Oil-Free Gas Delivery
US Patent:
6488120, Dec 3, 2002
Filed:
Sep 15, 2000
Appl. No.:
09/662535
Inventors:
Ralph C. Longsworth - Allentown PA
Assignee:
SHI-APD Cryogenics, Inc. - Allentown PA
International Classification:
F01M 100
US Classification:
184 617, 184 616
Abstract:
In an oil-lubricated helium compressor unit, the adsorber can retain all of the oil that might be transferred from the compressor to the adsorber before the system shuts down. No oil is ever transferred or transferable to, for example, the expander in a GM type refrigeration system connected to the unit. The compressor itself will shut down because of a protective switch or seize for lack of oil before any oil carries outside the compressor unit. The unit and the connected refrigeration system can run for more than a selected design life before the compressor shuts down because the limit of oil in the adsorber has been reached. The adsorber can retain as much oil as might leave the compressor over the life of the system plus a safety margin of at least 25%. The adsorber need not be serviced or replaced for the life of the system.
Fail-Safe Oil Lubricated Helium Compressor Unit With Oil-Free Gas Delivery
US Patent:
6554103, Apr 29, 2003
Filed:
Sep 11, 2002
Appl. No.:
10/244486
Inventors:
Ralph C. Longsworth - Allentown PA
Assignee:
Shi-Apd Cryogenics, Inc. - Allentown PA
International Classification:
F01M 100
US Classification:
184 617, 184 616
Abstract:
In an oil-lubricated helium compressor unit, the adsorber can retain all of the oil that might be transferred from the compressor to the adsorber before the system shuts down. No oil is ever transferred or transferable to, for example, the expander in a GM type refrigeration system connected to the unit. The compressor itself will shut down because of a protective switch or seize for lack of oil before any oil carries outside the compressor unit. The unit and the connected refrigeration system can run for more than a selected design life before the compressor shuts down because the limit of oil in the adsorber has been reached. The adsorber can retain as much oil as might leave the compressor over the life of the system plus a safety margin of at least 25%. The adsorber need not be serviced or replaced for the life of the system.
Two-Stage Inter-Phasing Pulse Tube Refrigerators With And Without Shared Buffer Volumes
US Patent:
6629418, Oct 7, 2003
Filed:
Jan 8, 2002
Appl. No.:
10/041700
Inventors:
Jin Lin Gao - Wescosville PA
Ralph C. Longsworth - Allentown PA
Ralph C. Longsworth - Allentown PA
Assignee:
SHI-APD Cryogenics, Inc. - Allentown PA
International Classification:
F25B 900
US Classification:
62 6, 60520
Abstract:
Disclosed are two-stage inter-phasing pulse tube refrigerators with and without shared buffer volumes.
Pulse Tube Integral Flow Smoother
US Patent:
6715300, Apr 6, 2004
Filed:
Apr 20, 2001
Appl. No.:
09/838840
Inventors:
Ralph C. Longsworth - Allentown PA
Assignee:
IGC-APD Cryogenics - Allentown PA
International Classification:
F25B 900
US Classification:
62 6, 165 4
Abstract:
Several layers of fine mesh screen are diffusion bonded together to form a rigid disc or plate that is self supporting and is a flow smoother at the ends of a pulse tube expander. Layers range from fine screens on the surface facing the pulse tube to coarser screens that provide structural support without significantly adding to pressure drop across the screen assembly. The flow smoother is typically used in series with a heat exchanger at the warm end that rejects heat to ambient from the gas of the pulse tube and a heat exchanger at the cold end that receives heat from the load being cooled.
Integral Pulse Tube Refrigerator And Cryopump
US Patent:
7165406, Jan 23, 2007
Filed:
Jan 8, 2003
Appl. No.:
10/500783
Inventors:
Ralph C. Longsworth - Allentown PA, US
Assignee:
SHI-APD Cryogenics, Inc. - Allentown PA
International Classification:
F25B 9/00
B01D 8/00
B01D 8/00
US Classification:
62 6, 62 555
Abstract:
An integrated cryopump and 2 stage pulse tube refrigeration system () comprising a cryopump, a compressor for a pulse tube refrigerator, a pulse tube refrigerator located within the vacuum chamber of the cryopump where the hot ends of the pulse tubes () are connected to each other through a buffer volume (), are integral to the cryopump vacuum chamber hosing, and a buffer volume () is connected to the hot ends () of the pulse tubes () through flow restrictors ().
Fast Warm Up Pulse Tube
US Patent:
7191600, Mar 20, 2007
Filed:
Mar 5, 2003
Appl. No.:
10/500982
Inventors:
Jin Lin Gao - Allentown PA, US
Ralph C. Longsworth - Allentown PA, US
Ralph C. Longsworth - Allentown PA, US
Assignee:
SHI-APD Cryogenics, Inc. - Allentown PA
Sumitomo Heavy Industries - Tokyo
Sumitomo Heavy Industries - Tokyo
International Classification:
F25B 9/00
US Classification:
62 6
Abstract:
This invention provides an improved means of quickly warming a pulse tube () by shifting the phase relation of flow to the warm end of the pulse tube relative to flow to the warm end () of the pulse tube relative to flow to the warm end of the regenerator () using a “four valve” concept and the “active buffer” concept. Several different pulse tube configurations and valve timing relations that are effective at reversing the cycle from the normal mode, which produces cooling at the pulse tube heat station, to a reverse mode that produces heating are disclosed.
Panels For Pulse Tube Cryopump
US Patent:
7201004, Apr 10, 2007
Filed:
Jan 8, 2003
Appl. No.:
10/500785
Inventors:
Ralph C. Longsworth - Allentown PA, US
Assignee:
SHI-APD Cryogenics, Inc. - Allentown PA
Sumitomo Heavy Industries, Ltd. - Tokyo
Sumitomo Heavy Industries, Ltd. - Tokyo
International Classification:
B01D 8/00
F25D 9/00
F25D 9/00
US Classification:
62 555, 62 6
Abstract:
The pulse tubes () and regenerators () contained within a cryopump housing () are arranged in a way that facilitates the fabrication and installation of the cryopanels (). The pulse tubes and regenerators are located in a common plane in the center of the cryopump housing and the cold (second stage) panels () that are pitched parallel to the plane with the tubes.
Pulse Tube Cooling By Circulation Of Buffer Gas
US Patent:
7305835, Dec 11, 2007
Filed:
Jan 8, 2003
Appl. No.:
10/500786
Inventors:
Ralph C. Longsworth - Allentown PA, US
Assignee:
SHI-APD Cryogenics, Inc. - Allentown PA
Sumitomo Heavy Industries, Ltd. - Tokyo
Sumitomo Heavy Industries, Ltd. - Tokyo
International Classification:
F25B 9/00
US Classification:
62 6
Abstract:
The present invention applies to single or two stage pulse tube refrigerators that have one or more passive orifices at the hot end(s) of the pulse tube(s) through which gas flows to achieve phase shifting and the phase shifting gas flow circulates to a remote heat sink by adding check valves and an appropriate piping circuit.
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