US4221092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sleeve
Assignee: Orica Ltd
•
Filing: 1976-10-19
•
Granted: 1980-09-09
•
Expires: 1996-10-19
Abstract
Abstract A fire barrier comprising an intumescent composition packed into the space between a thermoplastic pipe and an access hole or duct in a wall or floor through which the thermoplastic pipe is laid, said intumescent composition being characterized in that it will expand on heating to temperatures at which the thermoplastic pipe melts or burns, to form a fire resistant mass, said intumescent compound being present in sufficient amounts to completely fill the access hole or duct in its expanded state.
Inventors
- 👤 William L. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:04
CPC Classifications
F; F16; F16L; F16L5/00; F16L5/02; F16L5/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A fire barrier comprising an intumescent composition packed into the space between a thermoplastic pipe and an access hole or duct in a wall or floor through which the thermoplastic pipe is laid, said intumescent composition being characterised in that it will expand on heating to temperatures at which the thermoplastic pipe melts or burns, to form a fire resistant mass, said intumescent compound being present in sufficient amounts such that in its expanded state it will completely fill the access hole or duct which remains after the thermoplastic pipe has melted away or burned away.
Claim 2
Dependent Claim
96 words
A fire barrier comprising an intumescent composition packed into the space between a thermoplastic pipe and an access hole or duct in a wall or floor through which the thermoplastic pipe is laid, said intumescent composition being characterised in that it will expand on heating to temperatures at which the thermoplastic pipe melts or burns, to form a fire resistant mass, said intumescent compound being present in sufficient amounts such that in its expanded state it will completely fill the access hole or duct which remains after the thermoplastic pipe has melted away or burned away.
Claim 3
Dependent Claim
17 words
A fire barrier as in claim 1 wherein metallic heat conductors are embedded in the intumescent composition.
Claim 4
Dependent Claim
30 words
A fire barrier as in claim 2 wherein the metallic heat conductors extend through the intumescent composition in a direction parallel to the axis of the access hole or duct.
Claim 5
Dependent Claim
44 words
A fire barrier as in claim 1 wherein the intumescent composition is held in place by means of an annular metallic plate fixed at each end of the composition in order to decrease the tendency of the intumescent composition to expand axially when heated.
Claim 6
Dependent Claim
21 words
A fire barrier as in claim 1 wherein the intumescent composition is in the form of a solid integral annular sleeve.
Claim 7
Dependent Claim
78 words
A fire barrier as in claim 1 wherein metallic heat conductors extend through the intumescent composition in a direction parallel to the axis of the access hole or duct and wherein the intumescent composition is held in place by an annular metallic plate fixed at each end of the composition in a manner to decrease the tendency of the composition to expand axially when heated and to provide a heat collection area for the ends of the conductors.
References Cited (Backward Citations)
US2550560A
Cited
GB863195A
Cited
US3145811A
Cited
US3426491A
Cited
US3462890A
Cited
US3543460A
Cited
US3504615A
Cited
US3791912A
Cited
US3726050A
Cited
DE2154841A1
Cited
DE2162251A1
Cited
US3904111A
Cited
US3995102A
Cited
US3995102B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |