Minnesota Mining and Manufacturing Company

3m Innovative Properties Company

Scott G Theirl

Gerald E Drake

Matthew H Frey

Kenton D Budd

Richard A Miller

Paul S Lugg

Paul J Cobian

Kenneth A Aho

Jeffrey J Melby

John E Bailey

Susan M Olson

Lisa A Helmer

Filter for a visual display monitor

A low reflectivity, variable attenuation contrast enhancement filter having a total visible light reflectance of less than about 2.0% when measured with light incident to the first outer major surface. The contrast enhancement filter has a first layer(s) for providing antireflection, the first layer(s) defining the first outer major surface; a variable attenuation element interposed between the first major outer surface and the second major outer surface; element(s) for providing fixed attenuation interposed between the variable attenuation element and the first major outer surface; and at least one substrate.

Low reflectivity contrast enhancement filter

An optical filter screen for a visual display monitor includes an optical filter supported by a support frame. A pair of adjustable mounting members support the support frame from a visual display monitor or similar such that the optical filter is positioned adjacent a display area of the display monitor. Each mounting member includes a stem element with a first and second end. A support element is rotatably engaged with the first end of the stem element so that in a first stop position the support element extends outwardly from the stem element to engage a top surface of the visual display unit. The support element folds down into a second storage position in which it lies substantially parallel with the stem element.

Hinged, adjustable mounting mechanism for an optical filter screen

Light control film with reduced ghost images

An optical filter screen for a visual display monitor includes an optical filter supported by a support frame. A pair of adjustable mounting members support the support frame from the visual display monitor such that the optical filter is positioned adjacent a display area of the display monitor. Each mounting member includes a latch member that is movable between an unlatched state wherein the filter can be moved relative to the display area of the display monitor and a latched state wherein the filter is held in a desired position relative to the display area. Each mounting member further includes a movable latch operator for moving the latch member between the latched state and the unlatched state.

Adjustable mounting mechanism for an optical filter screen

A passive railroad crossing warning device has two input optical windows that receive light from the headlight of an oncoming locomotive. The light is redirected to an output optical window where a combiner causes it to exit at a predetermined angle to make it visible to motorists approaching the railroad crossing.

Passive railroad crossing warning system

Growing community of inventors

Saint Paul, MN, United States of America

Scott G Theirl