Patents by Inventor Donald H. Clarke

Donald H. Clarke 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).

  • Accessible tub and shower
    Patent number: 11930968
    Abstract: A walk-in tub, or combination walk-in tub and shower, having a front wall with an outwardly swinging door permitting easy entry into and egress from the tub by a user and an electromagnetic door latch assembly further comprising a plurality of electromagnetic door latches that are operatively interconnected to an electrical controller, a power supply and a rapid-release touch switch that can be selectively manipulated to interrupt the power supply to the electromagnetic latches, thereby allowing the door to swing open under emergency conditions even when the tub is filled with water.
    Type: Grant
    Filed: January 17, 2020
    Date of Patent: March 19, 2024
    Assignee: ROCA BATHROOM PRODUCTS INC.
    Inventor: Donald H. Clarke
  • Accessible Tub and Shower
    Publication number: 20210219787
    Abstract: A walk-in tub, or combination walk-in tub and shower, having a front wall with an outwardly swinging door permitting easy entry into and egress from the tub by a user and an electromagnetic door latch assembly further comprising a plurality of electromagnetic door latches that are operatively interconnected to an electrical controller, a power supply and a rapid-release touch switch that can be selectively manipulated to interrupt the power supply to the electromagnetic latches, thereby allowing the door to swing open under emergency conditions even when the tub is filled with water.
    Type: Application
    Filed: January 17, 2020
    Publication date: July 22, 2021
    Inventor: Donald H. Clarke
  • Method for the recovery of solvent vapors
    Patent number: 4519816
    Abstract: Polyurethane foams are employed to separate vapor of a volatile, organic liquid such as perchloroethylene from air or other gas containing the organic vapor. The absorbed, organic vapor can subsequently be recovered in liquid form by desorbing the vapor from the vapor laden foam and subsequently condensing the desorbed vapors.
    Type: Grant
    Filed: October 1, 1980
    Date of Patent: May 28, 1985
    Assignee: The Dow Chemical Company
    Inventor: Donald H. Clarke
  • Isocyanurate foams using a sulfonium zwitterion/metal carbonylate mixture as catalyst
    Patent number: 4390644
    Abstract: Stable isocyanurate foams are produced at rapid reaction rates by contacting an organic polyisocyanate with an active hydrogen compound such as a polyether polyol in the presence of an initiator comprising an ortho-sulfonium phenoxide and a carbonylate salt such as sodium acetate.
    Type: Grant
    Filed: May 18, 1981
    Date of Patent: June 28, 1983
    Assignee: The Dow Chemical Company
    Inventors: Donald H. Clarke, George J. Pomranky, Donald L. Schmidt
  • Process for reacting isocyanates in the presence of quaternary ammonium zwitterions
    Patent number: 4335219
    Abstract: The reaction of an isocyanate such as toluene diisocyanate with itself to form an isocyanurate or with an active hydrogen compound such as diethylene glycol to form a urethane is catalyzed by the presence of an ar-ammonium areneoxide such as 4-dodecyl-2-trimethylammonium phenoxide.
    Type: Grant
    Filed: April 6, 1981
    Date of Patent: June 15, 1982
    Assignee: The Dow Chemical Company
    Inventors: Donald H. Clarke, George J. Pomranky, Donald L. Schmidt