Patents by Inventor Michael P. McMahon
Michael P. McMahon 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: 11977118Abstract: A tester for a frequency-dependent ground fault interrupt wiring device, including: a tester circuit, including: a switch disposed between a first terminal and a second terminal, wherein a leakage current flows through a leakage path between the first terminal and the second terminal when a voltage is applied across the first terminal and the second terminal, a magnitude of the leakage current being determined, at least in part, by a conductivity of the switch; and a waveform generator configured to generate a periodic output signal having a frequency, wherein the switch is driven to modulate the magnitude of the leakage current such that the leakage current has a frequency substantially equal to a frequency of the waveform generator.Type: GrantFiled: March 1, 2021Date of Patent: May 7, 2024Assignee: Pass & Seymour, Inc.Inventors: Joshua P. Haines, Michael F. McMahon
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Patent number: 10317787Abstract: A display screen includes a filter layer, a fluorescent layer having parallel fluorescent stripes, and an attachment layer between an excitation side of the fluorescent layer and a first side of the filter layer to attach the excitation side of fluorescent layer to the filter layer while providing vertical separation therebetween. The attachment layer includes attachment regions that are separated from each other by lateral spacings such that excitation-side air gaps are formed between areas of the fluorescent layer and the filter layer that correspond to the lateral spacings. During display operation, excitation light received on a second side of the filter layer propagates through to the first side of the filter layer, and at least a portion of the excitation light that propagates from the second side of the filter layer travels through the excitation-side air gaps to excite the fluorescent stripes.Type: GrantFiled: August 3, 2018Date of Patent: June 11, 2019Assignee: Prysm, Inc.Inventors: Robert L. Graves, Michael P. McMahon, Philip J. Ralli
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Publication number: 20180348621Abstract: A display screen includes a filter layer, a fluorescent layer having parallel fluorescent stripes, and an attachment layer between an excitation side of the fluorescent layer and a first side of the filter layer to attach the excitation side of fluorescent layer to the filter layer while providing vertical separation therebetween. The attachment layer includes attachment regions that are separated from each other by lateral spacings such that excitation-side air gaps are formed between areas of the fluorescent layer and the filter layer that correspond to the lateral spacings. During display operation, excitation light received on a second side of the filter layer propagates through to the first side of the filter layer, and at least a portion of the excitation light that propagates from the second side of the filter layer travels through the excitation-side air gaps to excite the fluorescent stripes.Type: ApplicationFiled: August 3, 2018Publication date: December 6, 2018Inventors: Robert L. Graves, Michael P. McMahon, Philip J. Ralli
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Patent number: 10095099Abstract: A display screen includes a filter layer, a fluorescent layer having parallel fluorescent stripes, and an attachment layer between an excitation side of the fluorescent layer and a first side of the filter layer to attach the excitation side of fluorescent layer to the filter layer while providing vertical separation therebetween. The attachment layer includes attachment regions that are separated from each other by lateral spacings such that excitation-side air gaps are formed between areas of the fluorescent layer and the filter layer that correspond to the lateral spacings. During display operation, excitation light received on a second side of the filter layer propagates through to the first side of the filter layer, and at least a portion of the excitation light that propagates from the second side of the filter layer travels through the excitation-side air gaps to excite the fluorescent stripes.Type: GrantFiled: June 23, 2017Date of Patent: October 9, 2018Assignee: Prysm, Inc.Inventors: Robert L. Graves, Michael P. McMahon, Philip J. Ralli
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Publication number: 20170363945Abstract: A display screen includes a filter layer, a fluorescent layer having parallel fluorescent stripes, and an attachment layer between an excitation side of the fluorescent layer and a first side of the filter layer to attach the excitation side of fluorescent layer to the filter layer while providing vertical separation therebetween. The attachment layer includes attachment regions that are separated from each other by lateral spacings such that excitation-side air gaps are formed between areas of the fluorescent layer and the filter layer that correspond to the lateral spacings. During display operation, excitation light received on a second side of the filter layer propagates through to the first side of the filter layer, and at least a portion of the excitation light that propagates from the second side of the filter layer travels through the excitation-side air gaps to excite the fluorescent stripes.Type: ApplicationFiled: June 23, 2017Publication date: December 21, 2017Applicant: Prysm, Inc.Inventors: Robert L. Graves, Michael P. McMahon, Philip J. Ralli
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Patent number: 9690181Abstract: A display screen includes a filter layer, a fluorescent layer having parallel fluorescent stripes, and an attachment layer between an excitation side of the fluorescent layer and a first side of the filter layer to attach the excitation side of fluorescent layer to the filter layer while providing vertical separation therebetween. The attachment layer includes attachment regions that are separated from each other by lateral spacings such that excitation-side air gaps are formed between areas of the fluorescent layer and the filter layer that correspond to the lateral spacings. During display operation, excitation light received on a second side of the filter layer propagates through to the first side of the filter layer, and at least a portion of the excitation light that propagates from the second side of the filter layer travels through the excitation-side air gaps to excite the fluorescent stripes.Type: GrantFiled: October 8, 2015Date of Patent: June 27, 2017Assignee: Prysm, Inc.Inventors: Robert L. Graves, Michael P. McMahon, Philip J. Ralli
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Publication number: 20170104964Abstract: A display screen includes a filter layer, a fluorescent layer having parallel fluorescent stripes, and an attachment layer between an excitation side of the fluorescent layer and a first side of the filter layer to attach the excitation side of fluorescent layer to the filter layer while providing vertical separation therebetween. The attachment layer includes attachment regions that are separated from each other by lateral spacings such that excitation-side air gaps are formed between areas of the fluorescent layer and the filter layer that correspond to the lateral spacings. During display operation, excitation light received on a second side of the filter layer propagates through to the first side of the filter layer, and at least a portion of the excitation light that propagates from the second side of the filter layer travels through the excitation-side air gaps to excite the fluorescent stripes.Type: ApplicationFiled: October 8, 2015Publication date: April 13, 2017Applicant: Prysm, Inc.Inventors: Robert L. Graves, Michael P. McMahon, Philip J. Ralli
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Patent number: 7366533Abstract: Methods are disclosed for providing requested access, network-initiated access and autonomous access to communication resources (101-105) by wireless communication unit(s) (112, 114), and for controlling the different types of access using access control identifier(s) assigned to the devices. Requested access requires a communication unit to send a call request (302) to a communication resource controller (106). The request (302) includes at least an identification of the communication unit and an access control identifier associated with the communication unit. Network-initiated access comprises a communication resource controller or other fixed network equipment sending a page request (502) to the communication unit which responds with a page response message (504) including the identification of the communication unit and an access control identifier.Type: GrantFiled: May 16, 2001Date of Patent: April 29, 2008Assignee: Motorola, Inc.Inventors: Robert A Biggs, Jeffrey S Anderson, Michael P McMahon, Leslie G Gustafson, Jr.
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Patent number: 6559030Abstract: A method of forming a recessed polysilicon contact is provided. The method includes: forming a trench in a substrate; overfilling the trench with polysilicon; removing the polysilicon outside of the trench to provide a substantially planar surface; oxidizing the surface of the polysilicon in the trench using plasma oxidation; and removing an upper portion of the polysilicon from the trench.Type: GrantFiled: December 13, 2001Date of Patent: May 6, 2003Assignee: International Business Machines CorporationInventors: Thai Doan, Zhong-Xiang He, Michael P. McMahon
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Publication number: 20020173311Abstract: Methods are disclosed for providing requested access, network-initiated access and autonomous access to communication resources (101-105) by wireless communication unit(s) (112, 114), and for controlling the different types of access using access control identifier(s) assigned to the devices. Requested access requires a communication unit to send a call request (302) to a communication resource controller (106). The request (302) includes at least an identification of the communication unit and an access control identifier associated with the communication unit. Network-initiated access comprises a communication resource controller or other fixed network equipment sending a page request (502) to the communication unit which responds with a page response message (504) including the identification of the communication unit and an access control identifier.Type: ApplicationFiled: May 16, 2001Publication date: November 21, 2002Applicant: MOTOROLA, INC.Inventors: Robert A. Biggs, Jeffrey S. Anderson, Michael P. McMahon, Leslie G. Gustafson
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Patent number: 6387810Abstract: In a fabrication process, photoresist is disposed over a semiconductor substrate (10), covering a front surface (11) of the substrate (10) and filling trenches (12, 14, 16, 18) therein. The photoresist is planarized in chemical mechanical polishing to achieve a uniform thickness throughout the substrate (10). An anisotropic etching process partially removes the photoresist in the trenches (12, 14, 16, 18), thereby creating recesses in the trenches (12, 14, 16, 18). Because the thickness of the photoresist is uniform throughout the substrate (10) before the etching process, the depths of the recesses in different trenches (12, 14, 16, 18) are substantially equal to each other. A uniform recess depth throughout the substrate (10) is thereby achieved. The uniform recess depth facilitates in ensuring the semiconductor devices fabricated on the substrate (10) to have consistent parameters, characteristics, and performances.Type: GrantFiled: June 28, 1999Date of Patent: May 14, 2002Assignee: International Business Machines CorporationInventors: Gary J. Beardsley, Zhong X. He, Cuc K. Huynh, Michael P. McMahon
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Publication number: 20010002328Abstract: In a fabrication process, photoresist is disposed over a semiconductor substrate (10), covering a front surface (11) of the substrate (10) and filling trenches (12, 14, 16, 18) therein. The photoresist is planarized in chemical mechanical polishing to achieve a uniform thickness throughout the substrate (10). An anisotropic etching process partially removes the photoresist in the trenches (12, 14, 16, 18), thereby creating recesses in the trenches (12, 14, 16, 18). Because the thickness of the photoresist is uniform throughout the substrate (10) before the etching process, the depths of the recesses in different trenches (12, 14, 16, 18) are substantially equal to each other. A uniform recess depth throughout the substrate (10) is thereby achieved. The uniform recess depth facilitates in ensuring the semiconductor devices fabricated on the substrate (10) to have consistent parameters, characteristics, and performances.Type: ApplicationFiled: June 28, 1999Publication date: May 31, 2001Inventors: GARY J. BEARDSLEY, ZHONG X. HE, CUC K. HUYNH, MICHAEL P. MCMAHON