Patents by Inventor Alexander Stefan

Alexander Stefan 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: 4828342
    Abstract: Disclosed is a convertible computer desk with a construction that allows it to convert from a conventionally appearing desk into a configuration in which computer equipment, such as a monitor and related equipment, is raised to desktop level from internal storage and a keyboard is exposed. A pair of upright, space-apart support walls extend from the front to the rear of the desk and are provided with tracking means along their upper portions, and a concealable keyboard support shelf extends between forward parts of the support walls. A storage compartment located between the support walls holds an elevatable equipment platform for raising equipment from within the compartment to desktop level. A pair of rectangular desktop panels are mounted to the tracking means in a manner which allows them to be manipulated during conversion from one desk configuration to another.
    Type: Grant
    Filed: October 3, 1988
    Date of Patent: May 9, 1989
    Inventor: Alexander Stefan
  • Patent number: 4762457
    Abstract: A storage and retrieval system including a pair of spaced-apart longitudinally extending storage racks that provide a plurality of storage compartments, each compartment adapted to store a box-like bin which can contain smaller items, articles of commerce, and the like. Each storage compartment has an inner and outer opening adapted to receive and pass, respectively, a bin, and the compartments are arranged in longitudinally extending rows and in multileveled tiers. A plurality of rail pairs that incline downwardly at about 45 degrees are mounted between storage racks and are adapted to guide a bin placed thereon in speedy sliding motion under the force of gravity. There is means for moving a bin from a compartment and placing it, in alignment, upon an adjoining rail pair and releasing the bin. Near the lower part of the racks are take-off rails which curve from about 45 degrees, towards a horizontal direction, terminating just above a horizontally extending conveyor.
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: August 9, 1988
    Inventor: Alexander Stefan
  • Patent number: 4577446
    Abstract: This invention is a wall construction, made from a honey-combed framework and a concrete poured into the framework; the framework being made from expanded metal strips.
    Type: Grant
    Filed: March 8, 1984
    Date of Patent: March 25, 1986
    Inventor: Alexander Stefan
  • Patent number: 4550787
    Abstract: This invention is a machine assembly, including a post, an earth excavating machine and a crane interchangeably mountable on the post; the earth excavating machine including a sleeve enclosure around the post, a radially extending ground surface toothed scraper attached to the enclosure, a vertical screw inside the enclosure, and a loose earth conveyor belt extending from the sleeve, and the crane including a horizontal arm, a structure that rotates or elevates the arm and a cable assembly that suspends the arm adjustably from the post.
    Type: Grant
    Filed: July 5, 1983
    Date of Patent: November 5, 1985
    Inventor: Alexander Stefan