# US 5,707,752 A · Ceramic coatings to protect cellulosic products > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,752 A - Document ID: US5707752A - Status: Granted - Kind: A - Application number: 08/443,691 - Filed: 1995-05-18 - Granted: 1998-01-13 - Earliest claimed: 1995-05-18 - Assignees: Technology Licensing Associates, Inc. - Inventors: Mohan S. Misra; Edward A. Pierson - Web page: https://patentgrep.com/patent/US5707752A ## CPC - B32B 21/04: comprising wood as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/042; next to a bituminous or tarry layer B32B11/042; next to a water setting substance layer B32B13/10; next to a metal layer B32B15/10; next to a glass layer B32B17/062; next to a layer formed of natural mineral fibres or particles B32B19/042; next to a cellulosic plastic layer B32B23/044)} - B32B 21/00: Layered products comprising {a layer of} wood, e.g. wood board, veneer, wood particle board - B32B 23/00: Layered products comprising {a layer of} cellulosic plastic substances {, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose} - B32B 38/08: Impregnating - B32B 2260/026: Wood layer - B32B 2264/105: Metal - B32B 2310/14: Corona, ionisation, electrical discharge, plasma treatment - Y10T 428/31989: Of wood - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A cellulosic substrate is impregnated using a plasma gun. A plasma spray of a ceramic material is applied to a first surface of the cellulosic substrate. The ceramic material improves various properties of the first surface of the cellulosic substrate. ## Claims ### Claim 1 An article having a cellulosic substrate wherein said cellulosic substrate is impregnated by a plasma detonation spray of ceramic material. ### Claim 2 (depends on 1) The article of claim 1 wherein said cellulosic substrate is wood. ### Claim 3 (depends on 1) The article of claim 1 wherein said cellulosic substrate has a first surface and said first surface of said cellulosic substrate is impregnated by said ceramic material to the interior of said cellulosic substrate to a depth of from 1.times.10.sup.-5 to 1.times.10.sup.-1 inch. ### Claim 4 (depends on 1) The article of claim 1 wherein said cellulosic substrate has a first surface and said first surface of said cellulosic substrate is impregnated with said ceramic material wherein said ceramic material after impregnation extends above said first surface of said cellulosic substrate from 5.times.10.sup.-4 to 5.times.10.sup.-1 inch. ### Claim 5 (depends on 1) The article of claim 1 wherein said cellulosic substrate is selected from the group consisting of particle board, plywood, chip board and oriented strand board. ### Claim 6 An article having a cellulosic substrate wherein said cellulosic substrate is impregnated with a ceramic material, wherein said cellulosic substrate is wood. ### Claim 7 (depends on 6) The article of claim 6 wherein said cellulosic substrate has a first surface and said first surface of the cellulosic substrate is impregnated by said ceramic material to the interior of said cellulosic substrate to a depth of from 1.times.10.sup.-5 to 1.times.10.sup.-1 inch. ### Claim 8 (depends on 6) The article of claim 6 wherein said ceramic material is a metallic oxide. ### Claim 9 (depends on 6) The article of claim 6 wherein said cellulosic substrate is improved with regard to one or more properties of termite resistance, mildew resistance, or dry rot resistance compared to an identical non-impregnated cellulosic substrate. ### Claim 10 (depends on 6) The article of claim 6 wherein said ceramic material is selected from the group consisting of aluminum oxide and silicon dioxide and mixtures thereof. ### Claim 11 (depends on 6) The article of claim 6 wherein said cellulosic substrate has a first surface and said first surface of the cellulosic substrate is impregnated with said ceramic material wherein said ceramic material after impregnation extends above said first surface of said cellulosic substrate from 5.times.10.sup.-4 to 5.times.10.sup.- inch. ### Claim 12 An article having a cellulosic substrate with a thickness of at least about 25.times.10.sup.-2 inch wherein said cellulosic substrate is impregnated with a ceramic material. ### Claim 13 An article having a cellulosic substrate selected from the group consisting of particle board, plywood, chip board and oriented strand board wherein said cellulosic substrate is impregnated with a ceramic material. ### Claim 14 (depends on 13) The article of claim 13 wherein said ceramic material is selected from the group consisting of aluminum oxide and silicon dioxide and mixtures thereof. ### Claim 15 A method of construction comprising the steps of: providing a first article having a wooden cellulosic substrate impregnated with a ceramic material; providing a second article having a wooden cellulosic substrate impregnated with a ceramic material; and connecting said first article with said second article. ### Claim 16 (depends on 15) The method of claim 15 wherein said wooden cellulose substrates are selected from the group consisting of particle board, plywood, chip board and oriented strand board. ### Claim 17 (depends on 15) The method of claim 15 wherein said wooden cellulose substrate has a thickness of at least about 25.times.10.sup.-2 inch. ### Claim 18 A method of obtaining an article having a cellulosic substrate impregnated with a ceramic material comprising the steps of: obtaining said cellulosic substrate, said cellulose substrate being wood; orienting said cellulosic substrate to receive a treatment of said ceramic material; and impregnating said cellulosic substrate with said ceramic material; thereby obtaining the article having said cellulosic substrate impregnated with said ceramic material. ### Claim 19 (depends on 18) The method of claim 18 wherein said wooden cellulose substrates are selected from the group consisting of particle board, plywood, chip board and oriented strand board. ### Claim 20 A method of obtaining an article having a cellulosic substrate treated with a ceramic material comprising the steps of: obtaining said cellulosic substrate having a first surface; orienting said cellulosic substrate to receive a treatment of a plasma spray of said ceramic material on said first surface of said cellulosic substrate; and, subjecting said first surface of said cellulosic substrate to said plasma spray of said ceramic material; thereby obtaining the article having said cellulosic substrate treated with said ceramic material, wherein said cellulosic substrate is wood. ### Claim 21 (depends on 20) The method of claim 20 wherein said ceramic material is a metallic oxide. ### Claim 22 (depends on 20) The method of claim 20 wherein a carrier gas is employed to deliver said ceramic material to said plasma spray. ### Claim 23 (depends on 20) The method of claim 20 wherein said ceramic material is selected from the group consisting of aluminum oxide and silicon dioxide and mixtures thereof. ### Claim 24 (depends on 20) The method of claim 20 wherein said wooden cellulose substrate is selected from the group consisting of particle board, plywood, chip board and oriented strand board. ### Claim 25 (depends on 20) The method of claim 20 wherein said plasma spray comprises a plasma detonation spray. ### Claim 26 (depends on 25) The method of claim 25 wherein said wooden cellulose substrate is selected from the group consisting of particle board, plywood, chip board and oriented strand board. ### Claim 27 A method of obtaining an article having a cellulosic substrate treated with a ceramic material comprising the steps of: obtaining said cellulosic substrate having a first surface; orienting said cellulosic substrate to receive a treatment of a plasma detonation spray of said ceramic material on said first surface of said cellulosic substrate; and, subjecting said first surface of said cellulosic substrate to said plasma detonation spray of said ceramic material; thereby obtaining the article having said cellulosic substrate treated with said ceramic material.