Patents by Inventor T. Hirschfeld

T. Hirschfeld 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).

  • Gas chromatograph device
    Patent number: 4123236
    Abstract: An improved high resolution chromatograph device operable at column pressures ranging between one and fifty atmospheres absolute measured at the column exit, means for closely regulating the column carrier gas velocity including intermittent stop flow operation, and sample collection chamber means to facilitate contamination free handling and concentration of collected pure sample during spectral or other analysis of eluted samples. Velocity and stop flow control without loss of chromatographic resolution permits matching operation time of chromatograph to that of spectral or other analysis devices.
    Type: Grant
    Filed: February 28, 1975
    Date of Patent: October 31, 1978
    Assignee: Block Engineering Inc.
    Inventors: T. Hirschfeld, David C.A.G. Brown