# US 11,307,268 B2 · Covalently-bound anti-relaxation surface coatings and application in magnetometers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,307,268 B2 - Document ID: US11307268B2 - Status: Granted - Kind: B2 - Application number: 16/679,048 - Filed: 2019-11-08 - Published: 2020-06-18 - Granted: 2022-04-19 - Earliest claimed: 2018-12-18 - Assignees: Hi LLC - Applicants: Hi LLC - Inventors: Sukanta Bhattacharyya; Daniel Sobek - Web page: https://patentgrep.com/patent/US11307268B2 ## CPC - G01R 33/028: Electrodynamic magnetometers - G01R 33/032: using magneto-optic devices, e.g. Faraday {or Cotton-Mouton effect} - C09D 201/04: containing halogen atoms - C09D 201/10: containing hydrolysable silane groups - G01N 24/006: {using optical pumping (magnetometers using optical pumping G01R33/26, optical pumping of lasers H01S3/091)} - G01R 33/26: using optical pumping - A61B 5/245: specially adapted for magnetoencephalographic [MEG] signals - G01R 33/0094: {Sensor arrays} - G01R 33/025: Compensating stray fields {(G01R33/0017 takes precedence)} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A magnetometer includes a vapor cell having at least one wall, a chamber defined by the at least one wall, and alkali metal atoms disposed in the chamber to produce an alkali metal vapor in the chamber, wherein the at least one wall includes an oxide-containing interior surface; and an anti-relaxation coating disposed on the oxide-containing interior surface of the at least one wall of the vapor cell, wherein the anti-relaxation coating is a reaction product of the oxide-containing interior surface of the at least one wall with at least one mono- or dichlorosilane compound. ## Claims ### Claim 1 A magnetometer, comprising: a vapor cell comprising at least one wall, a chamber defined by the at least one wall, and alkali metal atoms disposed in the chamber to produce an alkali metal vapor in the chamber, wherein the at least one wall comprises an oxide-containing interior surface; and an anti-relaxation coating disposed on the oxide-containing interior surface of the at least one wall of the vapor cell, wherein the anti-relaxation coating is a reaction product of the oxide-containing interior surface of the at least one wall with at least one mono- or dichlorosilane compound selected from: wherein x, y, and z, when present, are each independently an integer in a range of 0 to 40. ### Claim 2 (depends on 1) The magnetometer of claim 1, wherein the at least one mono- or dichlorosilane compound comprises ### Claim 3 (depends on 1) The magnetometer of claim 1, wherein the at least one mono- or dichlorosilane compound comprises ### Claim 4 (depends on 1) The magnetometer of claim 1, wherein x, y, and z, when present, are each independently an integer in a range of 5 to 25. ### Claim 5 (depends on 1) The magnetometer of claim 1, wherein x, y, and z, when present, are equal. ### Claim 6 (depends on 1) The magnetometer of claim 1, wherein the oxide-containing interior surface comprises silicon dioxide. ### Claim 7 (depends on 1) The magnetometer of claim 1, wherein the oxide-containing interior surface comprises aluminum oxide. ### Claim 8 (depends on 1) The magnetometer of claim 1, wherein the vapor cell comprises quartz. ### Claim 9 (depends on 1) The magnetometer of claim 1, wherein the vapor cell comprises sapphire. ### Claim 10 (depends on 1) The magnetometer of claim 1, wherein the vapor cell comprises glass. ### Claim 11 (depends on 1) A magnetic field measurement system, comprising: at least one magnetometer of claim 1; at least one light source configured for directing light to the at least one magnetometer; and at least one detector configured to receive light that passes through the at least one magnetometer. ### Claim 12 (depends on 11) The magnetic field measurement system of claim 11, further comprising at least one magnetic field generator configured to produce a magnetic field at the vapor cell of the at least one magnetometer. ### Claim 13 (depends on 11) The magnetic field measurement system of claim 11, further comprising a computing device coupled to the at least one detector. ### Claim 14 (depends on 1) A method of making the magnetometer of claim 1, the method comprising: contacting the oxide-containing interior surface of the at least one wall of the vapor cell with the at least one mono- or dichlorosilane compound; and reacting the mono- or diclorosilane compound with the oxide-containing interior surface to form an anti-relaxation coating on the oxide-containing interior surface. ### Claim 15 (depends on 14) The method of claim 14, wherein the at least one mono- or dichlorosilane compound comprises ### Claim 16 (depends on 14) The method of claim 14, wherein the at least one mono- or dichlorosilane compound comprises ### Claim 17 (depends on 14) The method of claim 14, wherein the oxide-containing interior surface comprises silicon dioxide. ### Claim 18 (depends on 14) The method of claim 14, wherein the oxide-containing interior surface comprises aluminum oxide. ### Claim 19 (depends on 14) The method of claim 14, wherein the vapor cell comprises quartz. ### Claim 20 (depends on 14) The method of claim 14, wherein the vapor cell comprises sapphire.