US5348778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sandwich elements in the form of slabs, shells and the like
Assignee: Bayer AG
•
Filing: 1993-10-26
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Granted: 1994-09-20
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Expires: 2013-10-26
Abstract
Abstract Sandwich elements in the form of slabs, shells and the like, consisting of facings and a rigid polyurethane foam core can be joined together in an airtight and watertight manner when they are provided with edge profiles which are cast from casting materials forming flexible polyurethane foam and which have a groove and a tongue.
Inventors
- 👤 Ulrich Knipp
- 👤 Dieter Skoupi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:13
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/02; B32B3/06; E; E04; E04C; E04C2/00; E04C2/02; E04C2/26; E04C2/284; E04C2/292; E04F; E04F2201/00; E04F2201/01; E04F2201/0138; E04F2201/04; E04F2201/044; E04F2201/049; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/1376; Y10T428/139; Y10T428/1393; Y10T428/17; Y10T428/19; Y10T428/192; Y10T428/23; Y10T428/233; Y10T428/24; Y10T428/24777; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249991
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
46 words
A sandwich element comprising a rigid polyurethane foam core having sides and edges, facings covering said sides and edge profiles covering said edges, wherein said edge profiles are cast directly onto said edges from flexible polyurethane foam-forming materials and wherein said profiles have grooves and tongues.
Claim 2
Dependent Claim
46 words
A sandwich element comprising a rigid polyurethane foam core having sides and edges, facings covering said sides and edge profiles covering said edges, wherein said edge profiles are cast directly onto said edges from flexible polyurethane foam-forming materials and wherein said profiles have grooves and tongues.
Claim 3
Dependent Claim
24 words
The sandwich element of claim 1, wherein said edge profiles consist of untilled polyurethane foam with a Shore A hardness of less than 98.
Claim 4
Dependent Claim
25 words
The sandwich element of claim 2, wherein said edge profiles consist of untilled polyurethane foam with a Shore A hardness of between 60 and 90.
Claim 5
Dependent Claim
42 words
The sandwich element of claim 1, wherein one of said edge profiles is provided with a groove, and the opposite edge profile is provided with a tongue, and wherein each profile consists of a polyurethane foam with a different Shore A hardness.
Claim 6
Dependent Claim
27 words
The sandwich element of claim 1, wherein said edge profiles consist of filler-enriched polyurethane foam which has a coefficient of thermal expansion of <60×10 -6 /° C.
Claim 7
Dependent Claim
21 words
The sandwich element of claim 1, wherein said sandwich is provided with bevels which are filled up by the edge profile.
Claim 8
Dependent Claim
27 words
The sandwich element of claim 1, wherein said facings project beyond the rigid foam core and wherein the corresponding space is filled up by said edge profile.
Claim 9
Dependent Claim
16 words
The sandwich element of claim 1, wherein the groove and/or the tongue are provided with undercuts.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |