Patents Assigned to Christopher Scientific Company
  • Patent number: 4158395
    Abstract: A damping reduction suspension system is used in conjunction with a frequency dependent mass measuring unit to increase the accuracy and speed of mass measurement. The damping reduction system comprises a relatively low frequency suspension system coupled dynamically with a relatively high frequency mass measuring unit to minimize energy loss from the oscillating measuring element.
    Type: Grant
    Filed: August 4, 1977
    Date of Patent: June 19, 1979
    Assignee: Christopher Scientific Company
    Inventor: George J. Brown
  • Patent number: 4146099
    Abstract: Signal recording method and apparatus for efficiently correcting a bit error due to dropout occurred in recording an analog data into a digital data and reproducing the digital data is disclosed. The digital signal converted from the analog signal is divided into a plurality of groups to each of which a parity check bit is added. Record pattern is recorded on a record medium by a recording apparatus in accordance with a regular coding such as FM (frequency modulation) or MFM (modified frequency modulation) coding such that more than one bits in a group are not simultaneously influenced by the dropout, e.g. individual bits in a group are spaced from each other by several tracks. On reproducing, the coded digital signal is decoded into the original digital signal and the dropout is detected utilizing the nature of the regularity of the coding. The parity is checked for each of the groups.
    Type: Grant
    Filed: August 11, 1977
    Date of Patent: March 27, 1979
    Assignee: Christopher Scientific Company
    Inventors: Hiroshi Matsushima, Yasuharu Shimeki, Nobuyoshi Kihara