Patents by Inventor Robert F. Pfost

Robert F. Pfost 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).

  • Heated cover device
    Patent number: 5552580
    Abstract: A heated cover for a receptacle containing a vaporizable substance. The cover is heated to a temperature above the temperature of the substance so as to prevent condensation of vapor evaporated from the substance. A device for placing and removing the cover with respect to the receptacle is designed in connection with a temperature-controlled heating/cooling plate which controls the temperature of the contents of the receptacle.
    Type: Grant
    Filed: November 20, 1991
    Date of Patent: September 3, 1996
    Assignee: Beckman Instruments, Inc.
    Inventors: Robert F. Pfost, Nebojsa Avdalovic
  • Laboratory workstation using thermal vaporization control
    Patent number: 5496517
    Abstract: A heated cover for a receptacle containing a vaporizable substance. The cover is heated to a temperature above the temperature of the substance so as to prevent condensation of vapor evaporated from the substance. A device for placing and removing the cover with respect to the receptacle is designed in connection with a temperature-controlled heating/cooling plate which controls the temperature of the contents of the receptacle.
    Type: Grant
    Filed: November 20, 1991
    Date of Patent: March 5, 1996
    Assignee: Beckman Instruments, Inc.
    Inventors: Robert F. Pfost, Nebojsa Avdalovic
  • Dual tape transport system with tensioning means
    Patent number: 4199794
    Abstract: A dual magnetic tape cartridge includes a first reel-to-reel tape wound between two coplaner hubs. A tape loop, extending between the hubs, is guided along a first path and across a tape head access opening. The second tape, in belt form, is guided along a second path and across the tape head access opening at a different level. A drive belt, frictionally engaging first tape peripheries on the hubs, is entrained over portions of a forward drive roller and over portions of two spaced rear idlers. The second tape is entrained over slightly smaller diameter portions of the drive roller and over other portions of the rear idlers to thereby also function as a tensioning belt for the drive belt, causing greater tension in drive belt portions engaging the first tape on the hub acting as the takeup hub than in other belt portions engaging tape on the other hub.
    Type: Grant
    Filed: November 9, 1978
    Date of Patent: April 22, 1980
    Assignee: Newell Research Corporation
    Inventors: Robert F. Pfost, William E. Seaman, Chester W. Newell
  • Dual tape transport system with related method and means for reducing cueing time
    Patent number: 4135058
    Abstract: A dual magnetic tape cartridge includes a first reel-to-reel tape wound between two coplaner hubs. A tape loop, extending between the hubs, is guided along a first path and across a tape head access opening. The second tape, in belt form, is guided along a second path and across the tape head access opening at a different level. A drive belt, frictionally engaging first tape peripheries on the hubs, is entrained over portions of a forward drive roller and over portions of two spaced rear idlers. The second tape is entrained over slightly smaller diameter portions of the drive roller and over other portions of the rear idlers to thereby also function as a tensioning belt for the drive belt, causing greater tension in drive belt portions engaging the first tape on the hub acting as the takeup hub than in other belt portions engaging tape on the other hub.
    Type: Grant
    Filed: January 12, 1977
    Date of Patent: January 16, 1979
    Assignee: Newell Research Corporation
    Inventors: Robert F. Pfost, William E. Seaman, Chester W. Newell