Patents by Inventor Lee R. Webster

Lee R. Webster 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: 5493824
    Abstract: A housing (20) has an opening for receiving sunlight (54). The opening is covered with an ultraviolet-deflecting lens (50). The housing (20) contains reflectors (80, 82, 84) which direct sunlight (54) through a conduit (91) to a diffuser (98). The housing (20) rests upon and is rotatable with respect to an annular base (30). A horizontal sensor arrangement (66, 67, 68) controls rotational movement of the housing (20) with respect to the base (30) to maintain optimum horizontal alignment of the reflectors (80, 82, 84) with respect to the sun. A vertical sensor arrangement (63, 64, 65) causes vertical angular movement of the reflectors (80, 82, 84) to maintain optimum vertical alignment of the reflectors (80, 82, 84) with respect to the sun. The light conduit (91) contains an infrared-deflecting lens (92) to filter out infrared radiation. A dead air space (96) placed in the light conduit (91) prevents heat transfer as light is transmitted along the conduit (91).
    Type: Grant
    Filed: March 29, 1993
    Date of Patent: February 27, 1996
    Inventors: Lee R. Webster, Robert H. Richardson
  • Patent number: 5194782
    Abstract: The level of brightness of rapid-start fluorescent lighting is modulated over a range from full brightness at 100% lamp power consumption to minimum brightness at near 0% lamp power consumption. Fluorescent lamp brightness is modulated by controlling the amount of time during cycles of voltage application, such as 60 hz, when current flows through the lamp. An input signal voltage in a given range, for example, from 0 to 5 volts dc, is processed to provide an output which controls the duration of current flow. A cut-off circuit prevents any line voltage from being applied to the lamp at chosen values of input voltage. The cut-off circuit contains hysteresis elements which prevents the lamp from fluttering between off and on states. Modules connected to the lamp's heater elements maintain proper heater element voltage to ensure operation of the lamp form 0% to 100% brightness.
    Type: Grant
    Filed: July 19, 1991
    Date of Patent: March 16, 1993
    Inventors: Robert H. Richardson, Lee R. Webster
  • Patent number: 5170035
    Abstract: A circuit for controlling current flow in an instrumentation loop includes a light sensor receiving impinging light and delivering a signal varying with the intensity of the impinging light. The signal is amplified and produces a reference signal which is a current signal of about four milliamperes in the absence of incoming light and about twenty milliamperes in maximum light. A voltage controlled current driver presents an impedance to current flow through the loop which varies with the reference signal and with the intensity of the incoming light. The sensor includes a mounting plate, a photodetector mounted on the mounting plate, a filter mounted over the photodetector, and a diffuser mounted on the mounting plate forming a dome over the filter and photodetector. The diffuser disperses incoming light before the incoming light impinges the photodetector. The filter blocks infrared light thereby blue enchancing impinging light to approximate the light sensitivity response of a human eye.
    Type: Grant
    Filed: November 28, 1990
    Date of Patent: December 8, 1992
    Inventors: Lee R. Webster, Robert H. Richardson
  • Patent number: 4233545
    Abstract: This invention relates to an automatic lighting control system which employs a photosensitive detector in one leg of a bridge circuit for sensing the total effective level of both the natural and artificial illumination within an interior space. The unbalanced output of the bridge is fed into a pair of differential comparators for deriving a digital error signal representative of the level of illumination falling outside an acceptable range. A digital error signal is loaded into an intermediate shift register responsive to a clock signal. If an error signal of the type requiring a change in illumination is present, then a subsequent clock pulse will command a shift register to add or interrupt power to one or more lighting modules which supply artificial illumination to the interior space.
    Type: Grant
    Filed: September 18, 1978
    Date of Patent: November 11, 1980
    Inventors: Lee R. Webster, Gary J. Woods