Patents by Inventor Stephen A. Boettcher

Stephen A. Boettcher 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: 4047639
    Abstract: The regulator assembly comprises body member carried by a support and defining a cavity for detaining a pool of abrasive slurry. An overflow device is associated with the body member for establishing the upper level of a pool of abrasive slurry in the cavity. At least one flow-restrictive conduit component is secured at one end to the body member, communicates with the cavity at the lower end of the pool of abrasive slurry, and presents an outer end from which abrasive slurry is discharged. One of the above-indicated elements is movable whereby to selectively adjust the vertical distance between the plane of the upper level of the pool of abrasive slurry and the plane of the outer end of the conduit component.
    Type: Grant
    Filed: August 23, 1976
    Date of Patent: September 13, 1977
    Assignee: Speedfam Corporation
    Inventors: David M. McNamara, Stephen A. Boettcher
  • Patent number: 4047640
    Abstract: The regulator assembly comprises body member carried by a support and defining a cavity for detaining a pool of abrasive slurry. An overflow device is associated with the body member for establishing the upper level of a pool of abrasive slurry in the cavity. At least one flow-restrictive conduit component is secured at one end to the body member, communicates with the cavity at the lower end of the pool of abrasive slurry, and presents an outer end from which abrasive slurry is discharged. One of the above-indicated elements is movable whereby to selectively adjust the vertical distance between the plane of the upper level of the pool of abrasive slurry and the plane of the outer end of the conduit component.
    Type: Grant
    Filed: August 23, 1976
    Date of Patent: September 13, 1977
    Assignee: Speedfam Corporation
    Inventors: David M. McNamara, Stephen A. Boettcher
  • Patent number: 3991918
    Abstract: The regulator assembly comprises body means carried by a support and defining a cavity for detaining a pool of abrasive slurry. Overflow means is associated with the body means for establishing the upper level of a pool of abrasive slurry in the cavity. At least one flow-restrictive conduit means is secured at one end to the body means, communicates with the cavity at the lower end of the pool of abrasive slurry, and presents an outer end from which abrasive slurry is discharged. One of the above-indicated means is movable whereby to selectively adjust the vertical distance between the plane of the upper level of the pool of abrasive slurry and the plane of the outer end of the conduit means.
    Type: Grant
    Filed: November 4, 1974
    Date of Patent: November 16, 1976
    Assignee: Speedfam Corporation
    Inventors: David M. McNamara, Stephen A. Boettcher