Patents by Inventor Richard N. Cheever

Richard N. Cheever 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).

  • Readily attachable and detachable electron-beam permeable window assembly
    Patent number: 4631444
    Abstract: This disclosure involves an electron-beam permeable window assembly or cassette mounted in a frame readily insertable and removable from an electron-beam generator housing and, upon insertion, sealable thereto and to pathways carrying materials to be electron-beam irradiated through the window.
    Type: Grant
    Filed: February 20, 1986
    Date of Patent: December 23, 1986
    Assignee: Tetra Pak Developpement SA
    Inventor: Richard N. Cheever
  • Method of cold cathode replenishment in electron beam apparatus and replenishable cold cathode assembly
    Patent number: 4496881
    Abstract: This disclosure is concerned with automatically replenishable cold cathode structures and the like wherein the monitoring of a predetermined variation in electron beam performance caused by erosion of the cathode material generates control signals for advancing reserve cathode material into operative position.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: January 29, 1985
    Assignee: Tetra Pak Developpement SA
    Inventor: Richard N. Cheever
  • Electron beam-irradiating apparatus with conical bushing seal-support
    Patent number: 4439686
    Abstract: This disclosure is concerned with a process of and apparatus for producing relatively low energy electron beams through pulsed cold-cathode beam generation in a mode of operation involving an important intermediate region of a substantially linear depth-dose profile characteristic that reduces the sensitivity to possible voltage variations, and with improved triggering structures that significantly improve reliability and minimize erratic pulse generation and missing pulses, thus particularly adapting the process and apparatus for such stringent applications as production-line sterilization of surfaces, materials or workpieces passed by the apparatus.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: March 27, 1984
    Assignee: Tetra Pak Developpement Ltd.
    Inventor: Richard N. Cheever
  • Process of and apparatus for cold-cathode electron-beam generation for sterilization of surfaces and similar applications
    Patent number: 4367412
    Abstract: This disclosure is concerned with a process of and apparatus for producing relatively low energy electron beams through pulsed cold-cathode beam generation in a mode of operation involving an important intermediate region of a substantially linear depth-dose profile characteristic that reduces the sensitivity to possible voltage variations, and with improved triggering structures that significantly improve reliability and minimize erratic pulse generation and missing pulses, thus particularly adapting the process and apparatus for such stringent applications as production-line sterilization of surfaces, materials or workpieces passed by the apparatus.
    Type: Grant
    Filed: September 16, 1980
    Date of Patent: January 4, 1983
    Assignee: Tetra Pak Developpement SA
    Inventor: Richard N. Cheever
  • Process of and apparatus for cold-cathode electron-beam generation for sterilization of surfaces and similar applications
    Patent number: 4305000
    Abstract: This disclosure is concerned with a process of and apparatus for producing relatively low energy electron beams through pulsed cold-cathode beam generation in a mode of operation involving an important intermediate region of a substantially linear depth-dose profile characteristic that reduces the sensitivity to possible voltage variations, and with improved triggering structures that significantly improve reliability and minimize erratic pulse generation and missing pulses, thus particularly adapting the process and apparatus for such stringent applications as production-line sterilization of surfaces, materials or workpieces passed by the apparatus.
    Type: Grant
    Filed: November 3, 1978
    Date of Patent: December 8, 1981
    Assignee: Tetra Pak Developpement Ltd.
    Inventor: Richard N. Cheever