Patent US4839223A successfully refreshed from Google Patents.
US4839223A
Expired / Lapsed
US
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Fire-protective sealing element
Assignee: Irbit Research and Consulting AG
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Filing: 1988-10-24
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Granted: 1989-06-13
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Expires: 2008-10-24
Abstract
Abstract The invention relates to a sealing element for sealing openings in special walls subject to fire-protection requirements, brick wall breaches or the like, wherein for cost-effective manufacturability and processibility and simultaneously fire-protection assurance the sealing element is made of a precompressed strip, preferably impregnated with a chloroparaffin and neoprene base, with delayed restoration, the strip being interspersed with a heat-expanding intumescent compound in an essentially uniform distribution.
Inventors
- 👤 Rolf Tschudin-Mahrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:11
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/66; E04B1/68; E04B1/6812; E04B1/92; E04B1/94; E04B1/948; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/19; Y10T428/249921; Y10T428/249953; Y10T428/249954; Y10T428/249982; Y10T428/249983; Y10T428/249986
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
28 words
A sealing element for sealing openings in fire protective structures, said sealing element comprising a precompressed foam strip containing an essentially uniform distribution of a heat-expanding intumescent compound.
Claim 2
Dependent Claim
28 words
A sealing element for sealing openings in fire protective structures, said sealing element comprising a precompressed foam strip containing an essentially uniform distribution of a heat-expanding intumescent compound.
Claim 3
Dependent Claim
19 words
A sealing element according to claim 1, wherein the foam strip is precompressed to a degree of about 50%.
Claim 4
Dependent Claim
23 words
A sealing element according to claim 1, wherein the heat-expanding compound is present in individual pores of the foam strip in granule-like accumulations.
Claim 5
Dependent Claim
29 words
A sealing element according to claim 1, wherein said precompressed foam strip, after expansinn, is more readily compressible in the direction of precompression than in a direction perpendicular thereto.
Claim 6
Dependent Claim
21 words
A sealing element according to claim 1, including a self-adhesive foil on at least one longitudinal side of said foam strip.
Claim 7
Dependent Claim
16 words
A sealinq element according to claim 1, wherein said heat-expanding intumescent compound is ammonium polyphosphate polyacetate.
Claim 8
Dependent Claim
21 words
A sealing element according to claim 1, wherein said precompressed foam strip is also impregnated with a chloroparaffin and neoprene base.
Claim 9
Dependent Claim
15 words
A sealing element according to claim 1, wherein said foam strip is composed of polyurethane.
References Cited (Backward Citations)
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US4564550A
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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) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |