# US 9,434,142 B2 · Method of making a sandwich panel

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- Number: US 9,434,142 B2
- Document ID: US9434142B2
- Status: Granted
- Kind: B2
- Application number: 13/750,234
- Filed: 2013-01-25
- Published: 2013-08-01
- Granted: 2016-09-06
- Earliest claimed: 2012-01-26
- Assignees: E. I. Du Pont de Nemours and Company
- Applicants: Mikhail R Levit; Llewellyn Bentley Richardson, III; Warren Francis Knoff; Dariusz Wlodzimierz Kawka
- Inventors: Mikhail R Levit; Llewellyn Bentley Richardson, III; Warren Francis Knoff; Dariusz Wlodzimierz Kawka
- Web page: https://patentgrep.com/patent/US9434142B2

## CPC

- B32B 37/02: characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
- B32B 38/00: Ancillary operations in connection with laminating processes
- B29C 66/474: {said single elements being substantially non-flat}
- B29C 66/71: {characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125)}
- B29C 66/7254: {honeycomb structures}
- B29C 70/025: {with particular filler}
- B32B 3/12: characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
- B32B 37/146: {whereby one or more of the layers is a honeycomb structure}
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2262/106: Carbon fibres, e.g. graphite fibres
- B32B 2305/022: Foam
- B32B 2305/024: Honeycomb
- B32B 2607/00: Walls, panels
- Y10T 156/10: Methods of surface bonding and/or assembly therefor
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method of making a composite sandwich panel comprises the steps of (i) making a core structure, (ii) making at least one facesheet, (iii) bonding at least one of the at least one facesheets to the core structure, wherein the growth of a carbon nanotube structure is achieved during at least one of steps (i) to (iii).

## Claims

### Claim 1

A method of making a composite sandwich panel comprising the steps of
(i) making a honeycomb core structure comprising cell walls,
(ii) making at least one facesheet, and
(iii) bonding at least one of the at least one facesheets to the core structure, wherein growth of a carbon nanotube structure is achieved on a surface of or inside the honeycomb core cell walls during step (i) or step (iii) or after the core structure has been bonded to the at least one facesheet.

### Claim 2 (depends on 1)

The method of claim 1 wherein the core structure comprises a nonwoven sheet, a woven fabric or a unidirectional fabric.

### Claim 3 (depends on 2)

The method of claim 2 wherein the nonwoven sheet is a paper.