Patents by Inventor William K. Fisher

William K. Fisher 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: 20190313526
    Abstract: Tamper-respondent assemblies and fabrication methods are provided which utilize liquid crystal polymer layers in solid form. The tamper-respondent assemblies include a circuit board, and an enclosure assembly mounted to the circuit board to enclose one or more electronic components coupled to the circuit board within a secure volume. The assembly includes a tamper-respondent sensor that is a three-dimensional multilayer sensor structure, which includes multiple liquid crystal polymer layers, and at least one tamper-detect circuit. The at least one tamper-detect circuit includes one or more circuit lines in a tamper-detect pattern disposed on at least one liquid crystal polymer layer of the multiple liquid crystal polymer layers. Further, a monitor circuit is provided disposed within the secure volume to monitor the at least one tamper-detect circuit of the tamper-respondent sensor for a tamper event.
    Type: Application
    Filed: April 4, 2018
    Publication date: October 10, 2019
    Inventors: James A. BUSBY, John R. DANGLER, Mark K. HOFFMEYER, William L. BRODSKY, William SANTIAGO-FERNANDEZ, David C. LONG, Silvio DRAGONE, Michael J. FISHER, Arthur J. HIGBY
  • Patent number: 4749856
    Abstract: An optical sensing device which incorporates a suitable optical sensor system, preferably a fiber optics system, with a suitable environmental sensitive polymeric material is presented. The polymeric material must be of the type which undergoes wavelength-independent changes in optical properties in response to environmental changes. Accordingly, preferred polymers include crosslinked, semicrystalline polymers, high strength amorphous polymers, and polymer blends. This novel combination will accurately and, at times, reversibly measure and detect temperature, humidity, pressure, position, radiation, flow, stress/strain, light, color, electric field, and a plurality of other properties with respect to changes in the environment.
    Type: Grant
    Filed: May 29, 1986
    Date of Patent: June 7, 1988
    Assignee: Monsanto Company
    Inventors: George E. Walker, William K. Fisher