The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 2020
Filed:
May. 07, 2015
University of Southampton, Hampshire, GB;
Collin Lawrence Sones, Southampton, GB;
Robert William Eason, Southampton, GB;
Ioannis Nikolaos Katis, Southampton, GB;
University of Southampton, Southampton, Hampshire, GB;
Abstract
A method of making a fluid flow device comprises: providing a substrate of porous material () impregnated with a light-sensitive substance () in a first state and which is configured to change from the first state to a second state when exposed to light (), the second state being a solid state that is resistant to a solvent and the first being removable with the solvent; the substrate having a fluid flow channel () defined therein, the channel having a depth; exposing a beam of light () onto an area of the substrate surface within the fluid flow channel to deliver energy to a volume of the substrate below the area to change the light-sensitive substance to the second state; during exposure, creating a partial barrier to flow of fluid along the channel by controlling the amount of energy delivered to the volume below at least part of the area to change the light-sensitive substance to the second state in a volume of the substrate within the fluid flow channel that has a depth less than the depth of the fluid flow channel; and developing the substrate in the solvent to leave the light-sensitive substance which is in the solid state and remove the light-sensitive substance which is in the other state. The device may be a medical diagnostic device, and the substrate may be a paper substrate or may be a nitrocellulose substrate.