Patents by Inventor John-Andrew S. Hocker

John-Andrew S. Hocker 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).

  • In-situ passivation and insulation layer for a flexible thermal protection system (FTPS)
    Patent number: 10934028
    Abstract: A lightweight flexible BNNT mat or fabric provides improved thermal stability and shielding capabilities under a hypersonic thermal flux. The BNNT mat reduces the stagnation temperature and maintains a low regression rate. An in-situ passivation layer may be formed on the BNNT mat or fabric under high thermal flux. The passivation layer minimizes or prevents penetration of the atmosphere (air or gas) as well as heat and radiation through the thickness of the BNNT material, and it effectively diffuses heat throughout the mat or fabric laterally and radially to minimize localized excessive heat. A BNNT mat according to the present disclosure may also efficiently transfer heat from the BNNT material via radiation due to the high thermal emissivity (0.92) of the BNNT material.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: March 2, 2021
    Assignee: U.S.A. as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: John-Andrew S. Hocker, Cheol Park, Sang-Hyon Chu, Jin Ho Kang, Catharine C. Fay
  • Ductile-brittle transition of poly(amide) as determined by a heat of fusion-crystallinity number
    Patent number: 10605754
    Abstract: The heat of fusion is used as a measure of the brittleness of a semicrystalline polyamide part. Parts made of or which include semicrystalline polyamides can be replaced or be identified for replacement when they are or will become brittle based on periodic heat of fusion measurements.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: March 31, 2020
    Inventors: David E. Kranbuehl, John-Andrew S. Hocker
  • Ductile-Brittle Transition of Poly(amide) as Determined by a Heat of Fusion-Crystallinity Number
    Publication number: 20190170673
    Abstract: The heat of fusion is used as a measure of the brittleness of a semicrystalline polyamide part. Parts made of or which include semicrystalline polyamides can be replaced or be identified for replacement when they are or will become brittle based on periodic heat of fusion measurements.
    Type: Application
    Filed: December 1, 2017
    Publication date: June 6, 2019
    Inventors: David E. Kranbuehl, John-Andrew S. Hocker
  • In-Situ Passivation and Insulation Layer for a Flexible Thermal Protection System (FTPS)
    Publication number: 20180134418
    Abstract: A lightweight flexible BNNT mat or fabric provides improved thermal stability and shielding capabilities under a hypersonic thermal flux. The BNNT mat reduces the stagnation temperature and maintains a low regression rate. An in-situ passivation layer may be formed on the BNNT mat or fabric under high thermal flux. The passivation layer minimizes or prevents penetration of the atmosphere (air or gas) as well as heat and radiation through the thickness of the BNNT material, and it effectively diffuses heat throughout the mat or fabric laterally and radially to minimize localized excessive heat. A BNNT mat according to the present disclosure may also efficiently transfer heat from the BNNT material via radiation due to the high thermal emissivity (0.92) of the BNNT material.
    Type: Application
    Filed: November 15, 2017
    Publication date: May 17, 2018
    Inventors: John-Andrew S. Hocker, Cheol Park, Sang-Hyon Chu, Jin Ho Kang, Catharine C. Fay