3m Innovative Properties Company

Timothy L Quinn

Byron E Trotter

David G Freier

Thomas R Corrigan

Michael John Annen

Jonathan F Hester

Brent R Hansen

John J Emmel

Thomas R J Corrigan

The disclosure generally relates to concentrating daylight collectors and in particular to a light concentrator alignment system that can detect and correct for misalignment of the solar concentrator. The present disclosure generally relates to concentrating daylight collectors that can be used for illuminating interior spaces of a building with sunlight, and in particular to a light concentrator alignment system that can detect and correct for misalignment of the solar concentrator.

Light concentrator alignment system

The disclosure generally relates to concentrating daylight collectors and in particular to concentrating daylight collectors useful for interior lighting of a building. The concentrating daylight collectors generally include a cassegrain-type concentrator section that provides for a full-tracking solar collector with one moving part and with a high efficiency of coupling of collected solar irradiation to a stationary duct. In some cases, the disclosed concentrating daylight collectors can be used more conventionally, such as for directing sunlight onto a photovoltaic cell for generation of electrical power, or an absorbing surface for extraction of thermal energy.

Off-axis cassegrain solar collector

The invention is a display article having a flexible substrate which includes a writing surface capable of being used as a dry erase surface. A peripheral edge extends around the writing surface. A flexible framing strip is affixed to the writing surface at a position proximate to the peripheral edge. One embodiment of the display article can be made by forming a substrate having a writing surface. The substrate defines a periphery edge, a back surface, and a plurality of mushroom shaped hooks extending from the back surface substantially over the entire back surface. The writing surface is capable of being used as a dry erase surface. At least a portion of the periphery of the writing substrate is folded over to form a framing strip having a plurality of exposed mushroom shaped hooks. The framing strip is secured to the writing surface.

Dry erase article

Growing community of inventors

Maplewood, MN, United States of America

Timothy L Quinn