Patents by Inventor Richard DiMatteo

Richard DiMatteo 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).

  • Patent number: 4787239
    Abstract: A portable gas chromatographic detector includes two identical platinum coils mounted on identically aligned conducting posts. One coil is placed in an occluded chamber; the other coil is placed in an identical isolated chamber. Both coils have connection to legs of a bridge circuit and have substantially identical current flow passed along their length. Both chambers are preferably identically dimensioned and are large enough not to interfere with the field of the coils. The occluded chamber communicates through a short passageway with a passing classified gas stream from a chromatographic column. It has been found that the motion with respect to one coil is compensated with respect to the motion with the remaining coil so that the only differential in electrical resistance measured across the bridge circuit is that induced by the cooling property of helium on the heated coil in the occluded chamber. Cycling of the portable chromatograph includes a first short cycle.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: November 29, 1988
    Assignee: Mark Products, Inc.
    Inventor: Richard DiMatteo