Patents by Inventor David G. Killam

David G. Killam 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).

  • Document stacking table lowering method, apparatus and controlling circuitry therefor
    Patent number: 4189133
    Abstract: A document stacking table is lowered in steps under electronic control as the documents accumulate. A predetermined number of documents are stacked, after which the table is lowered by a predetermined amount. An optical sensing arrangement is used to determine the effective top of the stack of documents within the limits of "light sensed" and the "absence of light". If light is sensed, the count is increased and the table lowered again; in the absence of light the count is decreased and the table is again lowered. Thus the stacking table will be lowered by a fixed amount to the level of least error.
    Type: Grant
    Filed: November 3, 1978
    Date of Patent: February 19, 1980
    Assignee: International Business Machines Corporation
    Inventors: Fred V. Arrasmith, Donald G. Bruns, David G. Killam