3m Innovative Properties Company

Dora M Paolucci

Moses Mekala David

Neal A Rakow

John E Trend

Michael S Wendland

Richard J Poirier

Catherine A Leatherdale

Robert J DeVoe

Douglas Scott Dunn

Christopher Bland Walker, Jr

D Scott Thompson

John T Brady

Jeffrey M Florczak

Todd A Ballen

Craig R Sykora

Michael C Palazzotto

Jun-Ying Zhang

Stefan H Gryska

James B Carpenter

James P Mathers

James M Battiato

Nirmal K Viswanathan

An exposure indicating device disposed in a respirator system. The exposure indicating device comprises a diffractive optical element. The exposure indicating device comprises a material having an index of refraction that changes as a function of exposure to a chemical vapor, where the exposure indicating device provides an optical signal that changes in optical property as a function of exposure to the chemical vapor.

Exposure indicating device

Plasma deposited microporous analyte detection layers, method of forming analyte detection layers, and analyte sensors including the same are disclosed. An analyte sensor includes a substrate and a microporous amorphous random covalent network layer. The microporous amorphous random covalent network layer includes silicon, carbon, hydrogen and oxygen with a mean pore size in a range from 0.5 to 10 nanometers and an optical thickness in a range from 0.2 to 2 micrometers.

Plasma deposited microporous analyte detection layer

A sorbent media protective device includes an enclosure having a gas inlet, gas outlet and a thin-film multilayer indicator. The thin-film multilayer indicator is proximate sorbent media that can sorb a vapor of interest flowing from the gas inlet towards the gas outlet. The indicator includes a porous detection layer whose optical thickness changes in the presence of the vapor, located between a semireflective layer and a reflective layer permeable to the vapor. With equilibration at the applied vapor concentration between at least a portion of the media and the vapor, the vapor can pass through the reflective layer into the detection layer and change the detection layer optical thickness sufficiently to cause a visibly discernible change in the indicator appearance if viewed through the semireflective layer.

Organic vapor sorbent protective device with thin-film indicator

A process for making a microlens array or a microlens array masterform comprises

Process for making microlens arrays and masterforms

An optically-responsive multilayer reflective article is formed by applying a dilute solution or suspension of metallic nanoparticles to an optically-responsive detection layer. The solution or suspension is allowed to dry to form a semicontinuous liquid- or vapor-permeable light-reflective layer that will permit a liquid or vapor analyte to pass through the light-reflective layer to cause an optically-responsive change in the detection layer in the presence of the analyte.

Permeable nanoparticle reflector

A microporous carbon material includes a porous carbon skeleton having an average pore size from 0.1 to 10 nanometers and being substantially free of pores greater than 1 micrometer. Methods of forming the microporous carbon material are also disclosed.

Plasma deposited microporous carbon material

A method of making an optochemical sensor, the method comprising: providing a reflective substrate having a major surface; affixing a detection layer comprising at least one intrinsically microporous polymer to at least a portion of the major surface; depositing a substantially continuous semi-reflective metallic layer on at least a portion of the detection layer, the semi-reflective metallic layer comprising palladium and having a network of fine irregular cracks therein; and heating the detection layer and semi-reflective metallic layer in the presence of molecular oxygen at a temperature sufficient to cause the cracks to widen. Sensors prepared according to method are also disclosed.

Optochemical sensor and method of making the same

A cured coating for a siliceous material, preferably an optical fiber, comprises a thermally cured polyorganosilsesquioxane having an oxide powder dispersed therein. The oxide powder has a refractive index from about 1.2 to about 2.7 and includes particles having a particle size less than about 100 nanometers. The cured coating has adhesion to the siliceous material and is transparent to ultraviolet radiation.

Coating dispersions for optical fibers

Disclosed herein is a coated optical fiber comprising: a siliceous optical fiber including a core inside a cladding; and a cured coating comprising: a thermally cured polyorganosilsesquioxane; and an oxide powder dispersed in said cured polyorganosilsesquioxane, wherein said oxide powder has a refractive index from about 1.2 to about 2.7 and includes a plurality of particles having a particle size less than about 100 nanometers, said cured coating having adhesion to said siliceous optical fiber and further having transparency to ultraviolet radiation. Also disclosed herein is a fiber optic device comprising the optical fiber.

Coated optical fiber and fiber optic device having same

An optical waveguide, such as an optical fiber, including a length of waveguide and at least one discrete longitudinal section having increased photosensitivity with respect to other portions of the waveguide.

Growing community of inventors

Saint Paul, MN, United States of America

Dora M Paolucci