Patents Assigned to R. A. McDonald
  • Patent number: 5317766
    Abstract: A modular, retrofittable, and portable drain water recycle system, for installation into, and removal from, an existing host plumbing system having a host water supply, a sink, a tub or shower, a toilet, and a sewer. The modules include a drain fixture module, a system control module, and a storage tank module, all interconnectable. Gray water is collected from a tub, shower, or sink, by a drain fixture module, and is stored in a storage tank module for reuse in flushing a toilet. The drain fixture module and storage tank module are controlled by the system control module. Capacity can be altered by adding or removing storage tank modules. Different host systems can be accommodated by adding or removing drain fixture modules and system control modules. Drain fixture modules replace or are installed nearby existing P-traps, normally accessible. Storage tank modules and system control modules are of such shape and size as to fit under a typical sink inside the sink cabinet.
    Type: Grant
    Filed: June 21, 1993
    Date of Patent: June 7, 1994
    Assignees: John R. McDonald, Edward K. Rembert, Michael P. Henry
    Inventors: John R. McDonald, Michael P. Henry, Ronald J. Steele
  • Patent number: 5074503
    Abstract: A storage apparatus for use in motor vehicle repair and maintenance takes the form of a foldable tablelike structure which houses the vehicle underneath its top surface with its legs on either side of the vehicle. The legs being foldable when the apparatus is not in use to provide a collapsed or relatively flat arrangement which can be efficiently stored in minimum storage space when not in use.
    Type: Grant
    Filed: May 3, 1990
    Date of Patent: December 24, 1991
    Assignee: Carl R. McDonald
    Inventors: Carl R. McDonald, Ronald G. Hinkley, Brian Rollston
  • Patent number: 4644410
    Abstract: A dynamic threshold binary generator to generate a binary video image having a standard video signal fed to three positive peak detectors and three negative peak detectors, each group of three connected through respective OR gates to a sample and hold circuit then fed to an averaging circuit which then feeds to a comparator which also receives the standard video signal delayed, to then feed out the binary video image signal.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: February 17, 1987
    Assignee: R. A. McDonald
    Inventor: Roger J. Schlichtig