Patent US4581866A successfully refreshed from Google Patents.
US4581866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection of expanded material and other flammable materials of low compression strength from fire, especially in structural bearings
Assignee: Dixon International Ltd
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Filing: 1983-10-04
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Granted: 1986-04-15
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Expires: 2003-10-04
Abstract
Abstract A structural bearing is disclosed which comprises a bearing unit, intumescent material spaced from at least one side of the bearing unit to be protected from fire, and expanded plastics material which is of low compression strength relative to the bearing unit, adjacent to the one side of the bearing unit and disposed between the one side of the bearing unit and at least part of the intumescent material, the intumescent material being adjacent to the expanded plastics material.
Inventors
- 👤 Tessa Malcolm-Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:16
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; C; C08; C08J; C08J9/00; C08J9/36; C08J9/365; C09; C09D; C09D5/00; C09D5/18; C09D5/185; E04B1/36
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A structural bearing comprising a bearing unit, intumescent material spaced from at least one side of the bearing unit to be protected from fire and expanded plastics material, which is of low compression strength relative to the bearing unit, adjacent to said one side of the bearing unit and disposed between said one side of the bearing unit and at least part of the intumescent material, the intumescent material being adjacent to the expanded plastics material.
Claim 2
Dependent Claim
76 words
A structural bearing comprising a bearing unit, intumescent material spaced from at least one side of the bearing unit to be protected from fire and expanded plastics material, which is of low compression strength relative to the bearing unit, adjacent to said one side of the bearing unit and disposed between said one side of the bearing unit and at least part of the intumescent material, the intumescent material being adjacent to the expanded plastics material.
Claim 3
Dependent Claim
14 words
A structural bearing according to claim 1, wherein the intumescent material is a mastic.
Claim 4
Dependent Claim
36 words
A structural bearing according to claim 1, wherein the intumescent material comprises (a) melamine formaldehyde resin; (b) ammonium phosphate; (c) a carbonific; and (d) a cross-linking agent selected from the group consisting of dicyandiamide and guanidine
Claim 5
Dependent Claim
23 words
A structural bearing according to claim 3, wherein the filler material is polystyrene and is disposed on both sides of the intumescent material.
Claim 6
Dependent Claim
17 words
A structural bearing according to claim 1, wherein the filler material is polyurethane or an olefinic polymer.
Claim 7
Dependent Claim
13 words
A structural bearing according to claim 5, wherein the filler material is polystyrene.
Claim 8
Dependent Claim
29 words
A structural bearing according to any of claims 1, 5, or, 6 wherein the bearing unit is disposed in a through aperture in a slab of the filler material.
References Cited (Backward Citations)
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GB1601131A
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US4367295A
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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) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |