Patent US4956217A successfully refreshed from Google Patents.
US4956217A
Expired / Lapsed
US
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Silicate treated honeycomb structures
Assignee: Hexcel Corp
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Filing: 1988-12-22
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Granted: 1990-09-11
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Expires: 2008-12-22
Abstract
Abstract A laminate structure comprising a honeycomb core structure and facing sheets bonded thereto, said core being treated with a silicate impregnant/coating to impart improved flame resistance and to reduce heat transmission and toxic emissions upon exposure of said core to direct or indirect heat, flame and/or pyrolytic environment.
Inventors
- 👤 Richard R. Heitkamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:32
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/10; B32B3/12; B32B27/00; B32B27/06; B32B27/08; B32B7/00; B32B7/04; B32B7/12; C; C09; C09K; C09K21/00; C09K21/02; C09K21/14; E; E04; E04C; E04C2/00; E04C2/02; E04C2/26; E04C2/284; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2305/00; B32B2305/02; B32B2305/024; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; B32B2317/00; B32B2317/12; B32B2317/125; B32B2398/00; B32B2398/10; B32B2605/00; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
49 words
In a honeycomb-laminate composite structure comprising a cellular core and a facing sheet bonded to at least one face of the core, the improvement which provides flame retardant properties thereto comprising a cellular core substantially completely coated and/or impregnated with an effective fire retarding amount of a sodium silicate.
Claim 2
Dependent Claim
49 words
In a honeycomb-laminate composite structure comprising a cellular core and a facing sheet bonded to at least one face of the core, the improvement which provides flame retardant properties thereto comprising a cellular core substantially completely coated and/or impregnated with an effective fire retarding amount of a sodium silicate.
Claim 3
Dependent Claim
15 words
The composite structure of claim 1, wherein said core is impregnated with a thermosetting resin.
Claim 4
Dependent Claim
17 words
The composite structure of claim 2, wherein said sodium silicate is present as an independent coating layer.
Claim 5
Dependent Claim
21 words
The composite structure of claim 2, wherein dry sodium silicate is present in the thermosetting resin utilized to impregnate said core.
Claim 6
Dependent Claim
20 words
The composite structure of claim 1, wherein said facing sheet is a fiber reinforced material impregnated with a thermosetting resin.
Claim 7
Dependent Claim
20 words
The composite structure of claim, 1, wherein the silicate content is from 20 to 90% of the final core density.
Claim 8
Dependent Claim
24 words
The composite structure of claim 3, wherein the silicate is present in from about 10 to 100%, based on the weight, of the resin.
Claim 9
Dependent Claim
23 words
The composite structure of claim 4, wherein the silicate is present in an amount of 15 to 50%, by weight, of resin solids.
Claim 10
Dependent Claim
24 words
The composite structure of claim 1, wherein a thermosetting, thermoplastic or combined thermosetting-thermoplastic adhesive is utilized to bond the facing sheet to the core.
Claim 11
Dependent Claim
24 words
The composite structure of claim 1, wherein said sodium silicate has a weight ratio of sodium oxide to silica ranging from 1.5 to 4.0.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |