Patents by Inventor Stephen A. Hoffman

Stephen A. Hoffman 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).

  • Apparatus for collecting process generated fume and/or slag
    Patent number: 4502179
    Abstract: Method and system for collecting fume and/or waste particulate matter generated in a process used to surface treat, cut, gouge or join a workpiece by means of elevated temperature (e.g. electric arc).The system includes means to collect and quench the effluent (slag and/or fume) in a cooled nozzle coupled with means to separate solid particles and cooling fluid, in the case of a working environment including air and return cleansed air to the ambient environment.
    Type: Grant
    Filed: September 22, 1983
    Date of Patent: March 5, 1985
    Assignee: Arcair Company
    Inventors: William J. Coughlin, Perry J. Rieppel, Stephen A. Hoffman
  • Apparatus for collecting process generated fume and/or slag
    Patent number: 4426566
    Abstract: Method and system for collecting fume and/or waste particulate matter generated in a process used to surface treat, cut, gouge or join a workpiece by means of elevated temperature (e.g. electric arc).The system includes means to collect and quench the effluent (slag and/or fume) in a cooled nozzle coupled with means to separate solid particles and cooling fluid, in the case of a working environment including air and return cleansed air to the ambient environment.
    Type: Grant
    Filed: June 1, 1981
    Date of Patent: January 17, 1984
    Assignee: Arcair Company
    Inventors: William J. Coughlin, Perry J. Rieppel, Stephen A. Hoffman
  • Method for collecting process generated fume and/or slag
    Patent number: 4388514
    Abstract: Method and system for collecting fume and/or waste particulate matter generated in a process used to surface treat, cut, gouge or join a workpiece by means of elevated temperature (e.g. electric arc). The system includes a nozzle for collecting the slag and fume. The nozzle is cooled by fluid. In addition there is a filter to separate particles and to return clean air to the ambient.
    Type: Grant
    Filed: June 1, 1981
    Date of Patent: June 14, 1983
    Assignee: Arcair Company
    Inventors: William J. Coughlin, Stephen A. Hoffman, Perry J. Rieppel
  • Electrode drive and nozzle system for automatic air-carbon arc cutting and gouging torch
    Patent number: 4260867
    Abstract: An automatic air-carbon arc cutting and gouging torch having a drive for the elongated electrode consisting of opposed wheels biased toward the electrode for frictional contact to drive the electrode by driving one of the wheels. Each wheel can be adjusted about a pivot point to compensate for curvature of the electrode, changes in diameter, or mis-aligned joints in successive electrodes. The torch includes an improved nozzle to conduct both current and process air to the electrode thus lowering the operating temperature of the torch.
    Type: Grant
    Filed: March 30, 1979
    Date of Patent: April 7, 1981
    Assignee: Arcair Company
    Inventors: William J. Coughlin, Stephen A. Hoffman, Jerry R. Hummel
  • Air-carbon arc cutting and gouging torch
    Patent number: 4218605
    Abstract: A fixed head air-carbon arc cutting and gouging torch for use in a metal foundry for cleaning riser pads, sprues, fins and other excess or unwanted surface material or defects from castings. The torch is characterized by improved air flow means to reduce the required inlet air pressure, improved air valve means, better head angle and handle design for increased process efficiency.
    Type: Grant
    Filed: March 30, 1979
    Date of Patent: August 19, 1980
    Assignee: Arcair Company
    Inventors: Stephen A. Hoffman, Jerry R. Hummel
  • Air-carbon arc cutting and gouging torch
    Patent number: D258193
    Type: Grant
    Filed: February 13, 1978
    Date of Patent: February 10, 1981
    Assignee: Arcair Company
    Inventor: Stephen A. Hoffman