Patents by Inventor David James Evans
David James Evans 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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Publication number: 20240100855Abstract: Techniques are provided for printing white underbase image data and highlight white image data in one pass using digital printing technologies. The techniques include increasing the white ink in the white only (or near white only) areas of the image data by combining the white underbase image data and the white ink (or near white ink) image data.Type: ApplicationFiled: September 22, 2022Publication date: March 28, 2024Inventors: David John Evans, David James Reny
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Patent number: 11888587Abstract: A network element includes a port; and a device with circuitry configured to encode data for communication to a second device via a plurality of physical channels, and utilize one of the plurality of physical channels as a dedicated timing channel with encoding thereon different from encoding on the other plurality of physical channels, and interface encoded data via the plurality of physical channels with the port for transmission and reception with a second device.Type: GrantFiled: July 15, 2021Date of Patent: January 30, 2024Assignee: Ciena CorporationInventors: John Andrew Earl, David James Evans, David Stuart, Daniel Claude Perras
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Publication number: 20230369999Abstract: A method of controlling a brushless permanent-magnet motor having a phase winding and a rotor, includes applying voltages of first and second opposing polarities to the phase winding when the rotor is oscillating about a parking position, measuring a plurality of first times, each first time including a time taken for current flowing through the phase winding in response to an applied voltage of the first polarity to exceed a threshold and measuring a plurality of second times, each second time including a time taken for current flowing through the phase winding in response to an applied voltage of the second polarity to exceed the threshold. The method includes determining which of an average magnitude of the plurality of first times and an average magnitude of the plurality of second times has the smaller average magnitude, and determining an amplitude peak of the plurality of times having the smaller average magnitude.Type: ApplicationFiled: September 29, 2021Publication date: November 16, 2023Applicant: Dyson Technology LimitedInventors: Johannes Hendrik Jacob POTGIETER, David James EVANS
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Patent number: 11777628Abstract: A system includes a first module with a first clock; a second module with a second clock; and an Ethernet network interconnecting the first module and the second module by N Ethernet paths, N?2; wherein the first module is configured to provide timestamps encapsulated in replicated Ethernet packets to the second module over each of the N Ethernet paths for redundancy. The first module can be configured to obtain timestamps from a first clock with each timestamp having a sequence identifier, replicate each timestamp and its sequence identifier, and encapsulate each replicated timestamp and its sequence identifier in an Ethernet packet and transmit each Ethernet packet over one of the N Ethernet paths. The second module can be configured to receive Ethernet packets over the N Ethernet paths; and utilize a first Ethernet packet with a given sequence identifier for synchronization of the second clock with the first clock.Type: GrantFiled: November 23, 2021Date of Patent: October 3, 2023Assignee: Ciena CorporationInventors: John Andrew Earl, David James Evans, Daniel Claude Perras, David Stuart
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Publication number: 20230029041Abstract: A network element includes a port; and a device with circuitry configured to encode data for communication to a second device via a plurality of physical channels, and utilize one of the plurality of physical channels as a dedicated timing channel with encoding thereon different from encoding on the other plurality of physical channels, and interface encoded data via the plurality of physical channels with the port for transmission and reception with a second device.Type: ApplicationFiled: July 15, 2021Publication date: January 26, 2023Inventors: John Andrew Earl, David James Evans, David Stuart, Daniel Claude Perras
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Patent number: 11223437Abstract: A method, at an egress node, includes synchronizing with a global reference time; receiving a signal including a presentation time for when a specific part of the signal is to be transmitted, wherein the presentation time was determined by the ingress node with reference to the global reference time; determining an actual transmission time when the specific part of the signal is transmitted; and causing adjustment of a clock based on a time error derived from a difference between the presentation time and the actual transmission time.Type: GrantFiled: August 24, 2020Date of Patent: January 11, 2022Assignee: Ciena CorporationInventors: David James Evans, John Andrew Earl, Daniel Claude Perras
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Patent number: 11177897Abstract: A distributed Precision Time Protocol (PTP) Transparent Clock (TC) provides a TC function based on overall residence time in a network at a server layer. That is, the server layer operates as a distributed TC for a corresponding client layer. A transport network includes a first node connected to a first client device; and a second node connected to a second client device over a server layer, wherein the first client device communicates to the second client device via a client layer, wherein the first node and the second node are synchronized to one another, and wherein the first node and the second node are configured to implement a distributed transparent clock on a PTP packet at the client layer, the distributed transparent clock includes a correction field in the PTP packet based on a residence time in the transport network at the server layer.Type: GrantFiled: February 21, 2020Date of Patent: November 16, 2021Assignee: Ciena CorporationInventors: David James Evans, Daniel Claude Perras
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Publication number: 20210266085Abstract: A distributed Precision Time Protocol (PTP) Transparent Clock (TC) provides a TC function based on overall residence time in a network at a server layer. That is, the server layer operates as a distributed TC for a corresponding client layer. A transport network includes a first node connected to a first client device; and a second node connected to a second client device over a server layer, wherein the first client device communicates to the second client device via a client layer, wherein the first node and the second node are synchronized to one another, and wherein the first node and the second node are configured to implement a distributed transparent clock on a PTP packet at the client layer, the distributed transparent clock includes a correction field in the PTP packet based on a residence time in the transport network at the server layer.Type: ApplicationFiled: February 21, 2020Publication date: August 26, 2021Inventors: David James Evans, Daniel Claude Perras
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Patent number: 4089810Abstract: This invention relates to catalyst for use in the control of atmospheric pollution and, in particular to the purification of exhaust gases from internal combustion engines. Specific catalysts of the present invention comprise:(a) ruthenium or an alloy thereof and a metal oxide capable of forming a stable mixed oxide (or "ruthenite") with ruthenium dioxide;(b) a compound formed by ruthenium dioxide and a metal oxide capable of forming a stable mixed oxide (or "ruthenite") with ruthenium dioxide; and(c) a mixed oxide containing ruthenium, the oxide being selected from the group consisting of oxides of the pyrochlore type A.sub.2 B.sub.2 O.sub.7, the perovskite type ABO.sub.3, the ilmenite type B.sub.2 O.sub.3 and the spinel type AB.sub.2 O.sub.4.Particularly good results have been obtained where the platinum/ruthenium ratio is within the range 25 - 95 wt.% platinum and 5 - 75 wt.% ruthenium.Type: GrantFiled: June 28, 1976Date of Patent: May 16, 1978Assignee: Johnson, Matthey & Co., LimitedInventors: Alan Francis Diwell, William David James Evans
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Patent number: 3972837Abstract: This invention relates to catalyst for use in the control of atmospheric pollution and, in particular, to the purification of exhaust gases from internal combustion engines. Specific catalysts of the present invention comprise:A. ruthenium or an alloy thereof and a metal oxide capable of forming a stable mixed oxide (or "ruthenite") with ruthenium dioxide;B. a compound formed by ruthenium dioxide and a metal oxide capable of forming a stable mixed oxide (or ruthenite) with ruthenium dioxide; andC. a mixed oxide containing ruthenium, the oxide being selected from the group consisting of oxides of the pyrochlore type A.sub.2 B.sub.2 O.sub.7, the perovskite type ABO.sub.3, the ilmenite type B.sub.2 O.sub.3 and the spinel type AB.sub.2 O.sub.4.Particularly good results have been obtained where the platinum/ruthenium ratio is within the range 25- 95 wt.% platinum and 5 - 75 wt.% ruthenium.Type: GrantFiled: June 28, 1974Date of Patent: August 3, 1976Assignee: Johnson Matthey & Co., LimitedInventors: Gary James Keith Acres, Barry John Cooper, Alan Francis Diwell, William David James Evans