Patents by Inventor Mary S. McTavish
Mary S. McTavish has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5227946Abstract: Conductive polymer PTC compositions have improved properties, especially at voltages of 200 volts or more, if they are very highly cross-linked by means of irradiation, for example to a dosage of at least 50 Mrads, preferably at least 80 Mrads, e.g. 120 to 600 Mrads. The cross-linked compositions are particularly useful in circuit protection devices and layered heaters.Type: GrantFiled: April 13, 1992Date of Patent: July 13, 1993Assignee: Raychem CorporationInventors: Stephen M. Jacobs, Mary S. McTavish, Frank A. Doljack
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Patent number: 5195013Abstract: Conductive polymer PTC compositions have improved properties, especially at voltages of 200 volts or more, if they are very highly cross-linked by means of irradiation, for example to a dosage of at least 50 Mrads, preferably at least 80 Mrads, e.g. 120 to 600 Mrads. The cross-linked compositions are particularly useful in circuit protection devices and layered heaters.Type: GrantFiled: April 13, 1992Date of Patent: March 16, 1993Assignee: Raychem CorporationInventors: Stephen M. Jacobs, Mary S. McTavish, Frank A. Doljack
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Patent number: 5140297Abstract: Conductive polymer PTC compositions have improved properties, especially at voltages of 200 volts or more, if they are very highly cross-linked by means of irradiation, for example to a dosage of at least 50 Mrads, preferably at least 80 Mrads, e.g. 120 to 600 Mrads. The cross-linked compositions are particularly useful in circuit protection devices and layered heaters.Type: GrantFiled: June 1, 1990Date of Patent: August 18, 1992Assignee: Raychem CorporationInventors: Stephen M. Jacobs, Mary S. McTavish, Frank A. Doljack
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Patent number: 4955267Abstract: Conductive polymer PTC compositions have improved properties, especially at voltages of 200 volts or more, if they are very highly cross-linked by means of irradiation, for example to a dosage of at least 50 Mrads, preferably at least 80 Mrads, e.g. 120 to 600 Mrads. The cross-linked compositions are particularly useful in circuit protection devices and layered heaters.Type: GrantFiled: January 21, 1988Date of Patent: September 11, 1990Assignee: Raychem CorporationInventors: Stephen M. Jacobs, Mary S. McTavish, Frank A. Doljack
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Patent number: 4951384Abstract: Conductive polymer PTC compositions have improved properties, especially at voltages of 200 volts or more, if they are very highly cross-linked by means of irradiation, for example to a dosage of at least 50 Mrads, preferably at least 80 Mrads, e.g. 120 to 600 Mrads. The cross-linked compositions are particularly useful in circuit protection device and layered heaters.Type: GrantFiled: January 21, 1988Date of Patent: August 28, 1990Assignee: Raychem CorporationInventors: Stephen M. Jacobs, Mary S. McTavish, Frank A. Doljack
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Patent number: 4951382Abstract: Conductive polymer PTC compositions have improved properties, especially at voltage of 200 volts or more, if they are very highly cross-linked by means of irradiation, for example to a dosage of at least 50 Mrads, preferably at least 80 Mrads, e.g. 120 to 600 Mrads. The cross-linked compositions are particularly useful in circuit protection devices and layered heaters.Type: GrantFiled: January 21, 1988Date of Patent: August 28, 1990Assignee: Raychem CorporationInventors: Stephen M. Jacobs, Mary S. McTavish, Frank A. Doljack
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Patent number: 4845838Abstract: Conductive polymer PTC compositions have improved properties, especially at voltages of 200 volts or more, if they are very highly cross-linked by means of irradiation. The radiation dosage may be, for example, a dosage of at least 50 Mrads, preferably at least 80 Mrads, e.g. 120 to 600 Mrads. The cross-linked compositions are particularly useful in circuit protection devices and layered heaters.Type: GrantFiled: January 21, 1988Date of Patent: July 11, 1989Assignee: Raychem CorporationInventors: Stephen M. Jacobs, Mary S. McTavish, Frank A. Doljack
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Patent number: 4550301Abstract: Circuit protection devices comprise a PTC conductive polymer element and means for minimizing the adverse effects of carbonaceous dust evolved by the PTC element when it is tripped. An enclosure encloses, but is spaced apart from, the PTC element. In one embodiment at least part of the interior surface of the enclosure is composed of polytetrafluoroethylene, a ceramic or another material which discourages the formation of permanent low resistance paths through carbonaceous material lying on its surface. In another embodiment the enclosure has a large internal surface area compared to the volume of the PTC element. In further embodiments, electrical leads are connected to and pass through the enclosure, and at least one of the leads is insulated along its length and/or the leads pass through opposite ends of the enclosure.Type: GrantFiled: July 23, 1984Date of Patent: October 29, 1985Assignee: Raychem CorporationInventors: Mary S. McTavish, Robert W. Stodieck, Frank A. Doljack
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Patent number: 4549161Abstract: Circuit protection devices comprise a PTC conductive polymer element and means for minimizing the adverse effects of carbonaceous dust evolved by the PTC element when it is tripped. An enclosure encloses, but is spaced apart from, the PTC element. In one embodiment at least part of the interior surface of the enclosure is composed of polytetrafluoroethylene, a ceramic or another material which discourages the formation of permanent low resistance paths through carbonaceous material lying on its surface. In another embodiment the enclosure has a large internal surface area compared to the volume of the PTC element. In further embodiments, electrical leads are connected to and pass through the enclosure, and at least one of the leads is insulated along its length and/or the leads pass through opposite ends of the enclosure.Type: GrantFiled: July 23, 1984Date of Patent: October 22, 1985Assignee: Raychem CorporationInventors: Mary S. McTavish, Robert W. Stodieck, Frank A. Doljack
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Patent number: 4542365Abstract: Circuit protection devices comprise a PTC conductive polymer element and means for minimizing the adverse effects of carbonaceous dust evolved by the PTC element when it is tripped. An enclosure encloses, but is spaced apart from, the PTC element. In one embodiment at least part of the interior surface of the enclosure is composed of polytetrafluoroethylene, a ceramic or another material which discourages the formation of permanent low resistance paths through carbonaceous material lying on its surface. In another embodiment the enclosure has a large internal surface area compared to the volume of the PTC element. In further embodiments, electrical leads are connected to and pass through the enclosure, and at least one of the leads is insulated along its length and/or the leads pass through opposite ends of the enclosure.Type: GrantFiled: July 23, 1984Date of Patent: September 17, 1985Assignee: Raychem CorporationInventors: Mary S. McTavish, Robert W. Stodieck, Frank A. Doljack
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Patent number: 4481498Abstract: Circuit protection devices comprise a PTC conductive polymer element and means for minimizing the adverse effects of carbonaceous dust evolved by the PTC element when it is tripped. An enclosure encloses, but is spaced apart from, the PTC element. In one embodiment at least part of the interior surface of the enclosure is composed of polytetrafluoroethylene, a ceramic or another material which discourages the formation of permanent low resistance paths through carbonaceous material lying on its surface. In another embodiment the enclosure has a large internal surface area compared to the volume of the PTC element. In further embodiments, electrical leads are connected to and pass through the enclosure, and at least one of the leads is insulated along its length and/or the leads pass through opposite ends of the enclosure.Type: GrantFiled: February 17, 1982Date of Patent: November 6, 1984Assignee: Raychem CorporationInventors: Mary S. McTavish, Robert W. Stodieck, Frank A. Doljack