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US 5,247,277 AGranted
Electrical devices
AssigneeRaychem Corporation
InventorsShou-Mean Fang, Vijay K. Dhingra, Chi-Ming Chan, Daniel Chandler
Life of this patent
Estimating the term…
Abstract
An electrical device in which a first connection element is in electrical contact with a resistive element. The first connection element defines a cavity into which, when the cavity is empty, a second connection element can be inserted. The second connection element, which may be connected to a source of electrical power, is partially within the cavity, makes physical and electrical contact with the first connection element, and protrudes from the cavity. Such devices can be made in a continuous process by a method of the invention. They are particularly suitable for insertion into a circuit board.
Claims24
An electrical device which comprises
- (1) a resistive element which is the sole resistive element in the device and which is composed of a first material which
- (a) has a resistivity at 23.degree. C. of 10.sup.-3 to 10.sup.9 ohm-cm,
- (b) is a conductive polymer which comprises (i) an organic polymer, and (ii) dispersed in the polymer, a particulate conductive filler,
- (c) exhibits PTC behavior, and
- (d) has been prepared by a process which comprises a step in which the composition is melt-shaped;
- and
- (2) a first connection element which
- (a) is composed of a second material having a resistivity at 23.degree. C. of less than 10.sup.-3 ohm-cm,
- (b) defines a cavity into which, when the cavity is empty, a second connection element can be inserted so that it (i) is partially within the cavity, (ii) makes physical and electrical contact with the first connection element, and (iii) protrudes from the cavity, and
- (c) is embedded in the resistive element and is in physical and electrical contact with the resistive element.
7 more elements
An assembly which comprises
- (A) a circuit board, and
- (B) an electrical device which
- (1) is mounted on the circuit board,
- (2) comprises a resistive element which is the sole resistive element in the device and which is composed of a first material which
- (a) has a resistivity at 23.degree. C. of 10.sup.-3 to 10.sup.9 ohm-cm,
- (b) is a conductive polymer which comprises (i) an organic polymer, and (ii) dispersed in the polymer, a particulate conductive filler,
- (c) exhibits PTC behavior, and
- (d) has been prepared by a process which comprises a step in which the composition is melt-shaped,
- (3) comprises two first connection elements which are spaced apart from each other and each of which
- (a) is embedded in the resistive element and makes physical and electrical contact thereto,
- (b) is composed of a second material having a resistivity at 23.degree. C. of less than 10.sup.-3 ohm-cm, and
- (c) defines a cavity into which, when the cavity is empty, a second connection element can be inserted so that it (i) is partially within the cavity, (ii) makes physical and electrical contact with the first connection element, and (iii) protrudes from the cavity, and
- (4) further comprises two second connection elements, each of which
- (a) makes physical and electrical contact with a first connection element,
- (b) is composed of a fourth material which has a resistivity at 23.degree. C. of less than 10.sup.-3 ohm-cm,
- (c) lies partially within the cavity defined by one of the first connection elements, and
- (d) protrudes from said cavity.
14 more elements
An electrical device which comprises
- (1) a resistive element which is composed of a first material which
- (a) has a resistivity at 23.degree. C. of 10.sup.-3 to 10.sup.9 ohm-cm,
- (b) is a conductive polymer which comprises (i) an organic polymer, and (ii) dispersed in the polymer, a particulate conductive filler, and
- (c) exhibits PTC behavior;
- and
- (2) a first connection element which
- (a) is composed of a second material having a resistivity at 23.degree. C. of less than 10.sup.-3 ohm-cm,
- (b) defines a cavity into which, when the cavity is empty, a second connection element can be inserted so that it (i) is partially within the cavity, (ii) makes physical and electrical contact with the first connection element, and (iii) protrudes from the cavity, and
- (c) is in electrical contact with the resistive element,
- said device being made by a method which comprises
- (A) subjecting a conductive polymer composition to a treatment which brings it into physical and electrical contact with a preconnection element which is composed of the second material and which defines a cavity, the conductive polymer composition, after it has been subjected to said treatment, being the first material;
- and
- (B) cutting the product of step (A) so that the cavity, when it is empty, is accessible for insertion of a second connection element into the cavity so that the second connection element lies partially within the cavity and protrudes from the cavity.
10 more elements
An electrical device which comprises
- (1) a resistive element which is composed of a first material which
- (a) has a resistivity at 23.degree. C. of 10.sup.-3 to 10.sup.9 ohm-cm,
- (b) is a conductive polymer which comprises (i) an organic polymer, and (ii) dispersed in the polymer, a particulate conductive filler,
- (c) exhibits PTC behavior, and
- (d) has been prepared by a process which comprises a step in which the composition is melt-shaped;
- and
- (2) a first connection element which
- (a) is composed of a second material having a resistivity at 23.degree. C. of less than 10.sup.-3 ohm-cm,
- (b) defines a cavity into which, when the cavity is empty, a second connection element can be inserted so that it (i) is partially within the cavity, (ii) makes physical and electrical contact with the first connection element, and (iii) protrudes from the cavity,
- (c) is embedded in the resistive element, is in physical and electrical contact with the resistive element, and extends from one end of the resistive element to the other end, and
- (d) is a monolithic element.
8 more elements
Dependencies are inferred from the claim text.