Patents by Inventor Richard Francis Keenan

Richard Francis Keenan 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: 7216572
    Abstract: A table saw having a horizontal worktable, an open bottom base below the worktable enclosing a rotating blade that cuts wood objects on the worktable surface, and a stand for supporting the base from the floor. The table saw further including a sawdust collector for removable attachment to the base. The sawdust collector including a flexible catch bag with an opening at its top to receive the sawdust, a connection at the bottom for attachment to a vacuum device, and a zipper at the bottom for batch-wise collection and continuous discharge of sawdust. The outer peripheral edge of the top opening has a fastening structure, such as VELCRO, that permits the sawdust collector to be removably attached to a corresponding fastening structure of the table saw.
    Type: Grant
    Filed: March 26, 2004
    Date of Patent: May 15, 2007
    Inventor: Richard Francis Keenan
  • Publication number: 20040206220
    Abstract: A table saw having a horizontal worktable, an open bottom base below the worktable enclosing a rotating blade that cuts wood objects on the worktable surface, means for driving the saw blade, a saw blade elevating and tilting mechanism, with means for supporting the base from the floor has a sawdust collector for removable attachment to the underside of a table saw having a flexible catch bag with an opening at its top to receive the sawdust, a connection at the bottom for attachment to a vacuum device, and a zipper at the bottom for batch-wise collection and continuous discharge of sawdust. The outer peripheral edge of the top opening has a fastening structure, such as VELCRO, that permits the sawdust collector to be removably attached to a corresponding fastening structure under the table saw.
    Type: Application
    Filed: March 26, 2004
    Publication date: October 21, 2004
    Inventor: Richard Francis Keenan
  • Patent number: 4968823
    Abstract: A process for the fractional production of alkyltin oxides which comprises the steps of:subjecting a mono-, di- or trialkyltin halide to continuous hydrolysis at a temperature between 30.degree. to 100.degree. C. for a period of 10 minutes to 3 hours by the use of a 1% to 50% aqueous solution of a basic substance, thereby forming in the hydrolysis reaction mixture a dialkyltin oxide having an average particle diameter of 10 .mu.m or more, provided that where an intended alkyltin oxide is solid, the continuous hydrolysis is performed in the presence of an organic solvent slightly soluble in water and having a boiling point as measured under ordinary pressure of 150.degree. C. or lower and a specific gravity of 1.1 or smaller;allowing the resulting reaction mixture to stand, thereby to form three phases composed of an organic phase, an aqueous phase, and a phase consisting substantially of the dialkyltin oxide and having a specific gravity 0.
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: November 6, 1990
    Assignees: Yoshitomi Pharmaceutical Industries, Ltd., M & T Yoshitomi Chemicals, Ltd.
    Inventors: Aiichiro Kiyama, Hitoshi Kawaguchi, Yoshikazu Nakajima