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262results about How to "Shallow depth" patented technology

Manufacturing method of LED chip

The invention discloses a manufacturing method of an LED chip, wherein a procedure of removing one part of an epitaxial layer comprises the following steps of: forming a first mask film layer on the epitaxial layer, wherein the first mask film layer comprises a plurality of mask film layer units isolated from one another, and a first clearance with a predetermined size is arranged among the maskfilm layer units; removing a second semiconductor layer, a lighting layer and one part of a first semiconductor layer from a region where the first clearance is located to form a groove; eliminating the first mask film layer; repeating the steps for N times to remove parts of the epitaxial layer and a buffer layer until reaching a substrate, reserving an Nth clearance with predetermined size among the mask film layer units, wherein the width of the Nth clearance is greater than that of a (N-1)th clearance; forming an isolating groove with N steps, wherein N is not smaller than 2. By applying the technical scheme of the invention, the isolating groove has smaller depth and greater width as well as a certain inclination degree, thereby being beneficial to the coverage of an insulating material and the adhesion of metal connection wires, and solving the problem of breakage probably caused when the metal connection wires cross a deeper groove.
Owner:XIANGNENG HUALEI OPTOELECTRONICS

Permeable reaction wall in-situ repair method for preventing aquifer pollution

The invention discloses a permeable reaction wall in-situ repair method for preventing aquifer pollution. The method is characterized by adopting a permeable reaction wall horizontally arranged and a pumping well; the permeable reaction wall includes a ditch excavated in a pollution rain flowing path; a horizontal field is excavated in the ditch; a reactive medium is paved to form a horizontal permeable reaction wall body; the reactive medium material is selected according to pollutant repair mechanisms, and is layered; soil or sand is filled above the reactive permeable wall for covering to level with the bottom of the ditch; two sides of a wall body are tightly bonded a dam of the ditch to construct an impervious wall to guarantee polluted water to downwards permeate into an underground aquifer through the permeable reaction material wall body; the pumping well is a well, deep to reach the underground aquifer, drilled in middle of the horizontal permeable reaction wall; the well wall is produced by an impervious material; the well bottom is provided with a filter medium layer; and pumped water is from the underground aquifer. The method has the advantages of shallow ditch excavating and well drilling depths, easiness in material layering, high operability and good economic benefit.
Owner:HEFEI UNIV OF TECH +1
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