Ajay N Khatri, Age 66Arlington, VA

7114347, Oct 3, 2006

Oct 28, 2003

10/694699

Ajay Khatri - Bethlehem PA, US

F25B 43/02

62470, 62513

A closed cycle refrigeration system in conjunction with specific mixed or multiple component refrigerant fluids to produce temperatures in the range of 230 K to 70 K. The mixed component refrigerant can be blended from flammable or a non-flammable fluid components based upon the arrangement of the refrigeration equipment and the overall performance requirements for the system. A compressor, an after cooler, an oil separator, filter/dryer, heat exchanger, a throttle device with fixed orifice and an evaporator are arranged in a manner to improve system performance with refrigeration of the present invention or prior art refrigerants. Replaceable additional modules for oil filtration and moisture filtration can be part of the system.

2011000, Jan 13, 2011

Jul 7, 2010

12/831530

Ajay Khatri - Bethlehem PA, US

ColdEdge Technologies, Inc. - Allentown PA

F25B 19/00
F25D 23/00

62 511, 62295

A cryostat includes a thermal interface located at a first end and a cryocooler located at a second end. A thermal link has a thermal connector thermally linking the thermal interface and the cryocooler below a critical temperature. The thermal link is separated from one of the thermal interface and the cryocooler above the critical temperature. A method of operating the cryostat is also disclosed.

5579654, Dec 3, 1996

Jun 29, 1995

8/496468

Ralph C. Longsworth - Allentown PA
Mikhail J. Boiarsky - Moscow, RU
Ajay Khatri - Bethlehem PA

Apd Cryogenics, Inc. - Allentown PA

F25B 4106

62511

A closed cycle cryogenic refrigerating system with a fixed restrictor operates with a compressor inlet pressure in a range of 0. 1 Mpa to 0. 4 Mpa and compressor discharge pressure in a range of 1. 5 Mpa and 2. 5 Mpa. A basic cryogenic refrigerant mixture is used to which is added approximately 3% to 25% of helium, hydrogen and/or neon. A ratio of refrigerant density at the inlet of the fixed restrictor between steady-state operation and operation at the beginning of cool-down is in an approximate range of 7 to 17. Relatively rapid cool-down is achieved and evaporator temperature is maintained in an approximate range of 70K to 120K.

5385027, Jan 31, 1995

Aug 19, 1993

8/109390

Ralph C. Longsworth - Allentown PA
Ajay N. Khatri - Allentown PA

APD Cryogenics, Inc. - Allentown PA

F25B 1900

62 511

A device for cryogenic refrigerating of an object below the triple point temperature of the cryogen. The device includes a housing in which is placed a porous plug. A liquid cryogen is supplied to one side of the plug at a pressure greater than the triple point of the cryogen. A pressure below the triple point is maintained on the other side of the porous plug. The cryogen flows through the plug and forms a solid on the supply side of the plug. The solid cryogen provides cooling by sublimation on a continuous basis to a cold station thermally coupled to the plug.

5706663, Jan 13, 1998

Nov 20, 1995

8/560719

Mikhail Boiarski - Moscow Region, RU
Boris V. Yudin - Moscow Region, RU
Ralph C. Longsworth - Allentown PA
Ajay N. Khatri - Allentown PA

APD Cryogenics, Inc. - Allentown PA

F17C 1100

62114

Mixed refrigerants provide refrigeration at cryogenic temperatures with throttling cycles operating with a one-stage compressor. The refrigerants include noncondensable gases such as helium, neon, or hydrogen to increase the overall cooling capacity of a refrigeration system at the same refrigeration temperature which is attainable without such noncondensable gases. More refrigeration can be produced with existing systems at temperatures above the normal boiling point of nitrogen or argon by adding, for example, helium, than for refrigerant blends without helium. By increasing the return pressure value of the refrigeration cycle in relation to the molar percent of helium present in the refrigerant, a constant refrigeration temperature may be maintained which exhibits greater stability than prior systems operating at the same temperature without helium enrichment.

5595065, Jan 21, 1997

Jul 7, 1995

8/499259

Michael Boiarski - Moscow, RU
Ralph C. Longsworth - Allentown PA
Boris Yudin - Moscow, RU
Dennis H. Hill - Pottstown PA
Lawrence A. Klusmier - Germansville PA
Ajay N. Khatri - Bethlehem PA
Anthony L. Owoc - Harleysville PA

APD Cryogenics - Allentown PA

F25B 4100

62222

An integral combination of expansion valve and evaporator in a cryostat using a single support member. The valve includes two flow orifices, one orifice being used primarily for steady-state operation and the other orifice being used only during cool-down. An actuator having a high coefficient of thermal expansion moves a needle positioned in the cool-down orifice such that a large orifice flow area at the start of cool-down is automatically and continuously reduced as the actuator temperature decreases as refrigerant is throttled through the orifice. Within a range of approximately 30 K from the desired steady-state evaporator temperature, the needle completely blocks the cool-down orifice. Then, refrigerant flows through the steady-state orifice which has a remotely adjustable needle. In the final stage of cool-down, the refrigerant system is entirely controlled by the steady-state orifice and its associated needle.

2016029, Oct 13, 2016

Apr 8, 2016

15/093929

Ajay Khatri - Bethlehem PA, US
Terence Rufer - Oley PA, US

F25B 41/00
F25B 9/02
F25B 40/02
F25B 19/00

A system for cryogenic cooling of a remote cooling target comprising a cryogenic cooling device and a flexible cold fluid discharge interface, said flexible cold fluid discharge interface further comprising a flexible outer hose, a flexible middle recirculation line, a flexible inner hose, a flexible cryogen supply line, a first annular vacuum insulating area disposed between said flexible outer hose and said middle recirculation line, and a second annular vacuum insulating area disposed between said flexible inner hose and said flexible supply line. Said outer flexible hose, first evacuated annular segment, recirculation line, inner hose, second evacuated annular segment and supply line are arranged substantially concentrically. The system further comprising a first connecting means for connecting a first terminal end of the flexible cold fluid discharge interface to said cryogenic cooling device and a second connecting means comprising a rigid insertion member disposed at the second terminal end of the flexible cold fluid discharge interface for inserting into a remote cooling location;

2016012, May 5, 2016

Jul 28, 2014

14/434662

- Billerica MA, US
Ajay Khatri - Bethlehem PA, US

F17C 9/00
F16L 9/19

A closed cycle cryocooler system for cooling a sample includes a cryocooler that receives helium gas and provides a cooled helium gas, a flexible interface that receives the cooled helium gas and provides the cooled helium gas to a rigid stinger assembly configured and arranged to provide the cooled helium gas to a cryostat. The flexible interface may include a first gas flow path that routes gas to the rigid stinger assembly, and a second gas flow path receives return gas from the rigid stinger. The first gas flow path may be radially interior with respect to the second gas flow path