Patent US3786604A successfully refreshed from Google Patents.
US3786604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire stop between floor slab and curtain wall of building
Assignee: U F Chemical Corp
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Filing: 1971-12-06
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Granted: 1974-01-22
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Expires: 1991-12-06
Abstract
Abstract A fire stop separating superposed floors of a building having a concrete floor slab and a curtain wall horizontally separated by a gap to permit relative thermal expansion movement of the slab and wall essentially consists of a trough of pliable sheet steel filling the gap, and urea formaldehyde resin foam filling the upwardly open cavity of the trough. The foam chars, but does not burn in the event of a fire so as to retain its cellular structure and much of its thermal insulating properties, and the thin sheet steel can support the light foam and its own weight even at temperatures high enough to reduce the tensile strength of the steel.
Inventors
- 👤 F Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:52
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/66; E04B1/68; E04B1/6815; E04B1/6801; E04B1/92; E04B1/94; E04B1/948; E04B2/00; E04B2/88
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
28 words
In a building as set forth in claim 1, said trough member being secured to one of said elements and having a lip portion engaging the other element.
Claim 2
Dependent Claim
33 words
In a building as set forth in claim 2, said one element being said wall element and said lip portion engaging the major surface of said slab element directed toward an upper floor.
Claim 3
Dependent Claim
26 words
In a building as set forth in claim 2, said trough member being of arcuate cross section in a vertical plane perpendicular to said inner face.
Claim 4
Dependent Claim
25 words
In a building as set forth in claim 2, said lip portion being planar and substantially parallel to the engaged surface of said slab element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |