Patents by Inventor Marshall Randolph

Marshall Randolph 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).

  • High pressure filter
    Patent number: 11433338
    Abstract: A high pressure filter including first and second housings having complimentary tapered surfaces, a gasket located between the tapered surfaces, a filter element centrally disposed within the housings, and a compression collar fitted over the second housing and threaded onto the first housing is provided. Methods of making and using high pressure filters are also provided.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: September 6, 2022
    Assignee: ENTEGRIS, INC.
    Inventor: Marshall Randolph
  • HIGH PRESSURE FILTER
    Publication number: 20180193785
    Abstract: A high pressure filter including first and second housings having complimentary tapered surfaces, a gasket located between the tapered surfaces, a filter element centrally disposed within the housings, and a compression collar fitted over the second housing and threaded onto the first housing is provided. Methods of making and using high pressure filters are also provided.
    Type: Application
    Filed: July 1, 2016
    Publication date: July 12, 2018
    Inventor: Marshall RANDOLPH
  • Apparatus and method for reducing particle contamination in a vacuum chamber
    Patent number: 8172923
    Abstract: An apparatus and method for maintaining low gas velocity variation across a diffuser membrane during the vent-up of a vacuum chamber is disclosed. The diffuser membrane permeability and the pressure conditions across the membrane are chosen to minimize variation in gas flow velocity through the membrane during the vent-up cycle. This reduces re-distribution of particles from a vacuum chamber onto sensitive substrates in the vacuum chamber during vent-up from sub-atmospheric pressure to atmospheric pressure.
    Type: Grant
    Filed: January 21, 2009
    Date of Patent: May 8, 2012
    Assignee: Entegris, Inc.
    Inventors: Christopher Vroman, Marshall Randolph
  • APPARATUS AND METHOD FOR REDUCING PARTICLE CONTAMINATION IN A VACUUM CHAMBER
    Publication number: 20090183630
    Abstract: An apparatus and method for maintaining low gas velocity variation across a diffuser membrane during the vent-up of a vacuum chamber is disclosed. The diffuser membrane permeability and the pressure conditions across the membrane are chosen to minimize variation in gas flow velocity through the membrane during the vent-up cycle. This reduces re-distribution of particles from a vacuum chamber onto sensitive substrates in the vacuum chamber during vent-up from sub-atmospheric pressure to atmospheric pressure.
    Type: Application
    Filed: January 21, 2009
    Publication date: July 23, 2009
    Applicant: Entegris, Inc.
    Inventors: Christopher Vroman, Marshall Randolph