Patents by Inventor Stefan Maat

Stefan Maat 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).

  • Publication number: 20250091127
    Abstract: A fastener configured for an electrical power distribution application is disclosed. The fastener includes an aluminum (Al) metal matrix composite (MMC) comprising nanoscale carbon particles in a concentration of 0.01 to 2 percent by weight (wt %). The nanoscale carbon particles are evenly distributed throughout an entirety of the MMC. The fastener is useful for connecting conductors such as busbars, wires, or cables. Also disclosed is a method for fabricating the aluminum MMC fastener comprising a solid-state deformation process.
    Type: Application
    Filed: December 6, 2024
    Publication date: March 20, 2025
    Inventors: Kyle Deane, Markus Boehm, Jeyakumar Manickaraj, Stefan Maat, Douglas Meyers
  • Publication number: 20250066603
    Abstract: The present invention relates to an electrical connector including a housing and an electrical contact. The housing includes a polymer of butylene 2,5-furandicarboxylate (PBF), a polymer of butylene bifuranoate (PBBf), or a copolymer of butylene 2,5-furandicarboxylate (BF) and butylene bifuranoate (BBf), a copolymer of (i) ethylene 2,5 furandicarboxylate (EF) and (ii) one or both of BF and BBf, a copolymer of (i) butylene terephthalate (BT) and (ii) one or more of BF, BBf, and EF, or any combination thereof.
    Type: Application
    Filed: November 6, 2024
    Publication date: February 27, 2025
    Inventors: Stefan Maat, Rajkiran Tiwari
  • Publication number: 20250059366
    Abstract: The present invention relates to a keycap on top of a switching mechanism used as part of an integrated or peripheral keyboard or discrete switch. The keycap includes a polymer of butylene 2,5-furandicarboxylate (PBF), a polymer of butylene bifuranoate (PBBf), a copolymer of butylene 2,5-furandicarboxylate (BF) and butylene bifuranoate (BBf), a copolymer of ethylene 2,5-furandicarboxylate (EF) and one or both of BF and BBf, a copolymer of (i) butylene terephthalate (BT) and (ii) one or more of BF, BBf, and EF, or any combination thereof. The keycap is configured to mount on top of a switching mechanism of a key of a keyboard.
    Type: Application
    Filed: November 6, 2024
    Publication date: February 20, 2025
    Inventors: Stefan Maat, Rajkiran Tiwari
  • Publication number: 20240255490
    Abstract: A device for detecting one or more gases of ammonia (NH3), trimethylamine (TMA), and hydrogen sulfide (H2S) includes a substrate and an electrodes layer. The device also includes a gas sensor array including one or more gas sensing films, each electronically coupled with an electrode. Each gas sensing film is configured to chemically interact with a respective target gas. Each electrode is configured to measure resistance changes across the respective gas sensing film to which it is electronically coupled. The multiple gas sensing films include one or more of polyaniline (PANI) doped with camphor sulfonic acid (CSA) for chemically interacting with NH3 and/or TMA, PANI doped with 4-dodecylbenzenesulfonic acid (DBSA) for chemically interacting with TMA and/or NH3, and metal salt-doped PANI with poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) composite for chemically interacting with H2S.
    Type: Application
    Filed: January 30, 2023
    Publication date: August 1, 2024
    Inventors: Zhexiong Tang, Stefan Maat
  • Publication number: 20230307154
    Abstract: A busbar for electrical power distribution applications. The busbar includes an aluminum (Al) metal matrix composite (MMC) having nanoscale carbon particles (e.g., carbon nanotubes). In one example, the concentration of the nanoscale carbon particles is in a range of 0.01 to 2 percent weight (wt %). The nanoscale carbon particles are evenly distributed throughout an entirety of the Al-MMC.
    Type: Application
    Filed: May 17, 2023
    Publication date: September 28, 2023
    Inventors: Markus Boehm, Kyle James Deane, Jeyakumar Manickaraj, Stefan Maat, Douglas Meyers
  • Publication number: 20230290534
    Abstract: A busbar for electric power distribution comprises an aluminum (Al) alloy including scandium (Sc) and optionally including zirconium (Zr), erbium (Er), and/or ytterbium (Yb). In an example, the Sc and/or other elements are uniformly distributed throughout an entirety of the Al alloy. In an example, the Al is in a range of 98 to 99.99 percent by weight (wt %), and the scandium (Sc) is in a range of 0.01 to 0.5 wt %.
    Type: Application
    Filed: May 17, 2023
    Publication date: September 14, 2023
    Inventors: Kyle Deane, Markus Boehm, Jeyakumar Manickaraj, Stefan Maat
  • Publication number: 20230268108
    Abstract: A magnet wire including a conductive core of aluminum and carbon (e.g., carbon nanotubes). The magnet wire also includes an insulating layer on a surface of the conductive core. The insulating layer and the conductive core collectively form a fully insulated wire of a coil associated with a magnet. The magnet wire is configured to form, for example, the coil of the magnet for any of an electrical motor, an electrical generator, a transformer, an inductor, or a speaker.
    Type: Application
    Filed: April 28, 2023
    Publication date: August 24, 2023
    Inventors: Stefan Maat, Markus Boehm
  • Patent number: 11608460
    Abstract: This invention relates to using an imidazolium bromide ionic liquid as an additive to lithium bromide in the absorbent for an absorption chiller. The imidazolium bromide ionic liquid is useful to increase the working region and to lower the risk of crystallization in an absorption chiller. The invention provides an absorption chiller comprising a mixture of a refrigerant and an absorbent, and the absorbent comprises lithium bromide and one or more imidazolium bromide ionic liquids.
    Type: Grant
    Filed: January 12, 2021
    Date of Patent: March 21, 2023
    Assignee: YAZAKI CORPORATION
    Inventors: Satyabrata Raychaudhuri, Amirhossein Mehrkesh, George G. Tamas, Stefan Maat, Alberto Coronas Salcedo, Daniel Salavera Muñoz, Juan Prieto Gonzalez
  • Publication number: 20220223877
    Abstract: The present invention relates to a lithium ion battery cell having a cathode comprising an active material and about 1-5% by weight of single wall carbon nanotubes (SWCNT) as a conductive additive, wherein the SWCNT has an inorganic impurity content of less than 5% by weight. The LiB cathode of the present invention improves performance characteristics such as higher capacity, lower cell resistance, and retention of greater capacity with cycling of the fully assembled cell, in comparison to LiB cells using only conventional conductive carbon additive in the cathode.
    Type: Application
    Filed: March 30, 2022
    Publication date: July 14, 2022
    Inventors: Sean Imtiaz Brahim, Stefan Maat
  • Publication number: 20220093286
    Abstract: A transmission line cable with conductors includes a metal-matrix composite (MMC) conductor of carbon nanotubes (CNT) dispersed in aluminum (Al) metal matrix. The concentration of CNT is uniform throughout an entirety of the MMC conductor.
    Type: Application
    Filed: December 3, 2021
    Publication date: March 24, 2022
    Inventors: Stefan Maat, Markus Boehm
  • Publication number: 20210130669
    Abstract: This invention relates to using an imidazolium bromide ionic liquid as an additive to lithium bromide in the absorbent for an absorption chiller. The imidazolium bromide ionic liquid is useful to increase the working region and to lower the risk of crystallization in an absorption chiller. The invention provides an absorption chiller comprising a mixture of a refrigerant and an absorbent, and the absorbent comprises lithium bromide and one or more imidazolium bromide ionic liquids.
    Type: Application
    Filed: January 12, 2021
    Publication date: May 6, 2021
    Inventors: Satyabrata Raychaudhuri, Amirhossein Mehrkesh, George G. Tamas, Stefan Maat, Alberto Coronas Salcedo, Daniel Salavera Muñoz, Juan Prieto Gonzalez
  • Patent number: 10981794
    Abstract: The present invention is directed to a stable aqueous dispersion of carbon, wherein the carbon comprises between 75-85 wt. % activated carbon, and 15-25 wt. % CNT having a purity of at least 95 wt. %. The dispersion is free of surfactant and is stable for at least two weeks. The aqueous dispersion is useful to make an active layer for an electrode of a supercapacitor. The present invention is also directed to a supercapacitor cell having at least one electrode comprising a current collector and an active layer, wherein the active layer comprises activated carbon and high purity carbon nanotubes and is free of binder. The active layer materials are both porous and conductive in order to increase the charge storage capability and to decrease the electrode resistance. In general, the content of carbon nanotubes in the active layer is between 10 and 30 wt. % and the purity of the carbon nanotubes is at least 95 wt. %.
    Type: Grant
    Filed: August 3, 2020
    Date of Patent: April 20, 2021
    Assignee: YAZAKI CORPORATION
    Inventors: Stefan Maat, Satyabrata Raychaudhuri, Sean Imtiaz Brahim, Sanliang Zhang
  • Patent number: 10840032
    Abstract: The present invention is directed to a supercapacitor cell having at least one electrode comprising a current collector and an active layer, wherein the active layer comprises activated carbon and high purity carbon nanotubes and is free of binder. The active layer materials are both porous and conductive in order to increase the charge storage capability and to decrease the electrode resistance. In general, the content of carbon nanotubes in the active layer is between 10 and 30 wt. % and the purity of the carbon nanotubes is at least 95 wt. %.
    Type: Grant
    Filed: August 3, 2020
    Date of Patent: November 17, 2020
    Assignee: YAZAKI CORPORATION
    Inventors: Stefan Maat, Satyabrata Raychaudhuri, Sean Imtiaz Brahim, Sanliang Zhang
  • Patent number: 10465950
    Abstract: This invention relates to using a guanidinium-based ionic liquid as an absorbent material in an absorption chiller. The invention provides an absorption chiller comprising a mixture of a refrigerant and an absorbent, and the absorbent is a guanidinium-based ionic liquid. A preferred refrigerant is water. This invention also provides a method for synthesizing N,N,N?,N?,N?,N?-hexamethylguanidinium acetate.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: November 5, 2019
    Assignee: YAZAKI CORPORATION
    Inventors: Amirhossein Mehrkesh, Stefan Maat, George G. Tamas
  • Publication number: 20190113257
    Abstract: This invention relates to using a eutectic mixture of two ionic liquids, as an absorbent material in an absorption chiller. The invention provides an absorption chiller comprising a mixture of a refrigerant and an absorbent, and the absorbent is a eutectic mixture of two ionic liquids.
    Type: Application
    Filed: November 19, 2018
    Publication date: April 18, 2019
    Inventors: Amirhossein Mehrkesh, Stefan Maat, George G. Tamas
  • Patent number: 10168080
    Abstract: This invention relates to using a eutectic mixture of two ionic liquids, as an absorbent material in an absorption chiller. The invention provides an absorption chiller comprising a mixture of a refrigerant and an absorbent, and the absorbent is a eutectic mixture of two ionic liquids.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: January 1, 2019
    Assignee: YAZAKI CORPORATION
    Inventors: Amirhossein Mehrkesh, Stefan Maat, George G. Tamas
  • Publication number: 20170343250
    Abstract: This invention relates to using a eutectic mixture of two ionic liquids, as an absorbent material in an absorption chiller. The invention provides an absorption chiller comprising a mixture of a refrigerant and an absorbent, and the absorbent is a eutectic mixture of two ionic liquids.
    Type: Application
    Filed: May 26, 2017
    Publication date: November 30, 2017
    Inventors: Amirhossein Mehrkesh, Stefan Maat, George G. Tamas
  • Publication number: 20170343251
    Abstract: This invention relates to using a guanidinium-based ionic liquid as an absorbent material in an absorption chiller. The invention provides an absorption chiller comprising a mixture of a refrigerant and an absorbent, and the absorbent is a guanidinium-based ionic liquid. A preferred refrigerant is water. This invention also provides a method for synthesizing N,N,N?,N?,N?,N?-hexamethylguanidinium acetate.
    Type: Application
    Filed: May 26, 2017
    Publication date: November 30, 2017
    Inventors: Amirhossein Mehrkesh, Stefan Maat, George G. Tamas
  • Patent number: 9570100
    Abstract: A two-dimensional magnetic recording (TDMR) read head with an antiferromagnetic (AFM) layer recessed behind a center shield. The TDMR read head comprises a first read sensor and a center shield over the first read sensor, wherein the center shield has a first thickness at an air-bearing surface (ABS) and a second thickness at a back surface, the first thickness being greater than the second thickness. A ferromagnetic layer is disposed over a portion of the center shield, wherein the ferromagnetic layer is recessed from the ABS. The TDMR read head also includes an antiferromagnetic layer over the ferromagnetic layer and a second read sensor over the antiferromagnetic layer. By recessing the AFM layer away from the ABS, the down-track spacing between read sensors is reduced, thereby improving TDMR read head performance.
    Type: Grant
    Filed: October 21, 2015
    Date of Patent: February 14, 2017
    Assignee: Western Digital Technologies, Inc.
    Inventors: James Freitag, Zheng Gao, Stefan Maat
  • Patent number: 9177588
    Abstract: The embodiments of the present invention relate to a method for forming a magnetic read head with pinned layers extending to the ABS of the read head and magnetically coupled with an antiferromagnetic layer that is recessed in relation to the ABS of the read head. Portions of the antiferromagnetic layer and a magnetic layer that are extending to the ABS are removed, exposing a shield. A shielding material is formed on the exposed shield and a seed layer is formed on the shield and on or over a portion of the remaining antiferromagnetic layer. A pinned layer structure is formed on the seed layer and the magnetic layer.
    Type: Grant
    Filed: January 17, 2014
    Date of Patent: November 3, 2015
    Assignee: HGST NETHERLANDS B.V.
    Inventors: James Mac Freitag, Ying Hong, Cherngye Hwang, Stefan Maat, Masaya Nishioka, David John Seagle, Hicham Moulay Sougrati, Shuxia Wang, Yi Zheng, Honglin Zhu