Jianhua H Chen

US Patent:

6362721, Mar 26, 2002

Filed:

Aug 31, 1999

Appl. No.:

09/387275

Inventors:

Jianhua Joyce Chen - Sunnyvale CA
Susan Melsa Jordan - Mountain View CA

Assignee:

Tyco Electronics Corporation - Middletown PA

International Classification:

H01C 713

US Classification:

338 22R, 252511

Abstract:

A circuit protection device is formed from a resistive element composed of a PTC conductive polymer composition and two electrodes. The conductive polymer composition contains ethylene/vinyl acetate copolymer having a vinyl acetate component of less than 30% by weight of the copolymer, and a melting point of at most 105Â C. Devices of the invention have a resistive element thickness of 0. 025 to 0. 25 mm; a crosslinking level equivalent to 1 to 20 Mrads; a surface area of at most 120 mm ; a resistance at 20Â C. , R , of at most 0. 050 ohm; and a PTC anomaly from 20Â C. to (T +5Â C. ) of at least 10. The devices can be used as part of an assembly in which the device is in contact with a battery, e. g. a rechargeable battery.

US Patent:

7026026, Apr 11, 2006

Filed:

Dec 16, 2002

Appl. No.:

10/320937

Inventors:

David A. Ferrera - San Francisco CA, US
George C. Michaels - Westford MA, US
Ralph J. Barry - Hudson MA, US
Lixiao Wang - Maple Grove MN, US
Jianhua Chen - Plymouth MN, US

Assignee:

Boston Scientific Scimed, Inc. - Maple Grove MN

International Classification:

A61M 25/10

US Classification:

428 352, 428 355, 428 3691, 428483, 525165, 525178, 604 9301, 604 9601, 60410306, 60410309, 60410311, 264108

Abstract:

Balloons for use on medical devices such as catheter balloons are formed from polymer blend products which include a liquid crystal polymer (LCP), a crystallizable thermoplastic polymer, especially thermoplastic polyesters such as PET, and a compatabilizer. The compatabilizer may be an ethylene-maleic anhydride copolymer, an ethylene-methyl acrylate copolymer, an ethylene-methyl acrylate copolymer, an ethylene-methyl acrylate-maleic anhydride terpolymer, an ethylene-methyl-methacrylic acid terpolymer, an acrylic rubber, an ethylene-ethyl acrylate-glycidyl methacrylate terpolymer or a mixture of two or more such polymers.

US Patent:

8289122, Oct 16, 2012

Filed:

Mar 24, 2009

Appl. No.:

12/383560

Inventors:

Martyn A. Matthiesen - Fremont CA, US
Jianhua Chen - Sunnyvale CA, US
Anthony Vranicar - Santa Clara CA, US

Assignee:

Tyco Electronics Corporation - Berwyn PA

International Classification:

H01H 85/04
H01H 85/02

US Classification:

337167, 337297

Abstract:

A reflowable thermal fuse includes a positive-temperature-coefficient (PTC) device that defines a first end and a second end, a conduction element that defines a first end and a second end in electrical communication with the second end of the PTC device, and a restraining element that defines a first end in electrical communication with the first end of the PTC device and a second end, in electrical communication with a second end of the conduction element. The restraining element is adapted to prevent the conduction element from coming out of electrical communication with the PTC device in an installation state of the thermal fuse. During a fault condition, heat applied to the thermal fuse diverts current flowing between the first end of the PTC device and the second end of the conduction element to the restraining element, causing the restraining element to release the conduction element and activate the fuse.

US Patent:

8581686, Nov 12, 2013

Filed:

Mar 24, 2009

Appl. No.:

12/383595

Inventors:

Matthew P. Galla - Mountain View CA, US
Jianhua Chen - Sunnyvale CA, US
Martyn A. Mattheisen - Fremont CA, US

Assignee:

Tyco Electronics Corporation - Berwyn PA

International Classification:

H01H 37/76
H01H 85/143
H01H 71/20

US Classification:

337409, 337231, 337314, 337315, 337317, 337388, 337148, 29623

Abstract:

A reflowable thermal fuse includes a conduction element with first and second ends, disposed within a housing. The reflowable thermal fuse also includes an elastic element disposed within the housing and adapted to apply force on the conduction element in an activated state of the reflowable thermal fuse. A restraining element is utilized to secure the elastic element and prevent the elastic element from applying force on the conduction element in an installation state of the reflowable thermal fuse. Application of an activating current through the restraining element causes the restraining element to break and thereby release the elastic element and place the reflowable thermal fuse in the activated state.

US Patent:

20010019751, Sep 6, 2001

Filed:

Mar 19, 2001

Appl. No.:

09/810361

Inventors:

David Ferrera - San Francisco CA, US
George Michaels - Westford MA, US
Ralph Barry - Hudson MA, US
Lixiao Wang - Maple Grove MN, US
Jianhua Chen - Plymouth MN, US

International Classification:

B32B001/08

US Classification:

428/035200, 428/036900

Abstract:

Balloons for use on medical devices such as catheter balloons are formed from polymer blend products which include a liquid crystal polymer (LCP), a crystallizable thermoplastic polymer, especially thermoplastic polyesters such as PET, and a compatabilizer. The compatabilizer may be an ethylene-maleic anhydride copolymer, an ethylene-methyl acrylate copolymer, an ethylene-methyl acrylate copolymer, an ethylene-methyl acrylate-maleic anhydride terpolymer, an ethylene-methyl-methacrylic acid terpolymer, an acrylic rubber, an ethylene-ethyl acrylate-glycidyl methacrylate terpolymer or a mixture of two or more such polymers.

US Patent:

20110050384, Mar 3, 2011

Filed:

Aug 27, 2009

Appl. No.:

12/583981

Inventors:

Jianhua Chen - Sunnyvale CA, US
Martyn A. Matthiesen - Fremont CA, US
Antonio F. Contreras - Fremont CA, US

Assignee:

Tyco Electronics Corporation - Berwyn PA

International Classification:

H01H 85/06

US Classification:

337296

Abstract:

A thermal fuse includes a first contact surface connected to a top surface of a sensor and a bottom surface connected to a bottom surface of the sensor. The sensor includes a mixture of Sn and Zn. The distance between the top surface and the bottom surface of the sensor is sized to substantially limit Zn depletion in a center region of the sensor when a temperature of the sensor is below a melting temperature of the sensor. The center region of the sensor prevents the first contact surface and the second contact surface from separating when the temperature of the sensor is below the melting temperature, and the first contact surface and the second contact surface are configured to separate when the temperature of the center region of the sensor exceeds the melting temperature of the sensor.

US Patent:

20120194958, Aug 2, 2012

Filed:

Aug 12, 2011

Appl. No.:

13/209146

Inventors:

Martyn A. Matthiesen - Fremont CA, US
Jianhua Chen - Sunnyvale CA, US
Matthew P. Galla - Los Altos CA, US
Anthony Vranicar - Santa Clara CA, US
Wayne Montoya - Redwood City CA, US

International Classification:

H02H 5/04
H05K 13/00

US Classification:

361103, 29825

Abstract:

A circuit protection device includes a substrate with first and second electrodes connected to the circuit to be protected. The circuit protection device also includes a heater element between the first and second electrodes. A sliding contact is connected by a sensing element to the first electrode, second electrode, and heater element, thereby bridging and providing a conductive path between each. A spring element is held in tension by, and exerts a force parallel to a length of the substrate against, the sliding contact. A flux material is provided around the sensing element. Upon detection of an activation condition, the sensing element releases the sliding contact and the force exerted by the spring element moves the sliding contact to another location on the substrate at which the sliding contact no longer provides a conductive path between the first electrode, second electrode, and heater element. The flux allows the sliding contact to move without dragging the sensing material.

US Patent:

20130200984, Aug 8, 2013

Filed:

Aug 6, 2012

Appl. No.:

13/567784

Inventors:

Martyn A. Matthiesen - Fremont CA, US
Jianhua Chen - Sunnyvale CA, US
Matthew P. Galla - Holly Springs NC, US
Anthony Vranicar - Santa Clara CA, US
Wayne Montoya - Redwood City CA, US
Christopher Pasma - Mountain View CA, US

Assignee:

Tyco Electronics Corporation - Berwyn PA

International Classification:

H01H 37/76

US Classification:

337186

Abstract:

A circuit protection device includes a substrate with first and second electrodes connected to the circuit to be protected. The circuit protection device also includes a heater element. A sensing element facilitates an electrical connection between the first and second electrodes. A flux material is provided around the sensing element. In a preferred embodiment, the flux contains a first component that is a polar material and a second component that is a non-polar material. A spring element exerts a force on the sensing element. The sensing element resists the force applied by the spring element. Upon detection of an activation, or fault, condition, the sensing element loses resilience and no longer resists the force exerted by the spring element, resulting in the spring element severing the electrical connection between the first and second electrodes. The flux allows the spring element to sever with electrical connection without dragging the sensing element.