Patents by Inventor Robert E. Fletcher

Robert E. Fletcher 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 piston liquid flow controller
    Patent number: 5046925
    Abstract: A gas piston liquid flow controller comprising a pumping chamber of fixed volume, means to separately introduce into said chamber pressurized gas and liquid, means to detect the presence of liquid at predetermined upper and lower levels in said chamber, means to withdraw a stream of liquid from said chamber for delivery to a point of use and a controller to maintain liquid in said chamber to effect constant delivery of liquid to the point of use.
    Type: Grant
    Filed: January 8, 1991
    Date of Patent: September 10, 1991
    Assignee: Air Products and Chemicals, Inc.
    Inventor: Robert E. Fletcher
  • Chemical refill system
    Patent number: 4979643
    Abstract: A system for automatically filling a bubbler, or other vapor delivery system from a reservoir, is disclosed in which the conduit system is purged and pressurized with inert gas, using a unique refill reservoir, level sensing and valving system.
    Type: Grant
    Filed: March 22, 1989
    Date of Patent: December 25, 1990
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Bruce A. Lipisko, John C. Schumacher, Richard E. Howard, Peter T. Randke, Adrian Sandu, Robert E. Fletcher, Hans-Juergen Graf
  • Chemical refill system
    Patent number: 4859375
    Abstract: A system for automatically filling a bubbler, or other vapor delivery system from a reservoir, is disclosed in which the conduit system is purged and pressurized with inert gas, using a unique refill reservoir, level sensing and valving system.
    Type: Grant
    Filed: December 29, 1986
    Date of Patent: August 22, 1989
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Bruce A. Lipisko, John C. Schumacher, Richard E. Howard, Peter T. Randtke, Adrian Sandu, Robert E. Fletcher, Hans-Juergen Graf
  • Vacuum vapor transport control
    Patent number: 4842827
    Abstract: A vacuum vapor transport control system and method for controlling the rate of vapor flow from a reagent reservoir into a vacuum system through an orifice calibrated as to size or flow rate using a high purity fixed gas and vapor provided from multiple reservoirs or mixed vapor provided from a single reservoir.
    Type: Grant
    Filed: December 30, 1986
    Date of Patent: June 27, 1989
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Hans-Juergen Graf, Robert E. Fletcher, Peter T. Randtke, Bruce E. Rhine, J. R. Monkowski