Patent US4549381A successfully refreshed from Google Patents.
US4549381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite joist system
Assignee: Individual
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Filing: 1983-11-02
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Granted: 1985-10-29
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Expires: 2003-11-02
Abstract
Abstract A T-shaped construction element for use in combination with an open web joist to support spanner bars, and a composite open web joist and concrete slab construction which results from the use of that combination.
Inventors
- 👤 Neal Holtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:27
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/02; E04B5/14; E04B1/00; E04B1/18; E04B1/26; E04B1/2604; E04B1/2612; E04B5/16; E04B5/17; E04B5/23; E04B5/29
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
175 words
A method of erecting formwork for pouring a slab in place on substantially parallel steel joists, each joist being in the form of a truss having an open web, a top chord and a bottom chord, said top chord comprising a pair of spaced-apart parallel metal bars welded to opposite sides of said web, said method comprising: installing a plurality of T-shaped spanner bar support clips at spaced-apart positions on said joists, each of said support clips being substantially aligned with at least one support clip at an adjacent joist, each of said support clips comprising a horizontal plate member adapted to be supported on the top chord by the upper surface of said spaced-apart metal bars, a vertical plate member adapted to extend between said spaced-apart metal bars into the open web portion of said joist, and aperture means in said vertical plate member to accommodate and support a spanner bar; inserting opposite ends of spanner bars into the aperture means of aligned support clips; and placing concrete form panels on said spanner bars.
Claim 2
Independent Claim
175 words
A method of erecting formwork for pouring a slab in place on substantially parallel steel joists, each joist being in the form of a truss having an open web, a top chord and a bottom chord, said top chord comprising a pair of spaced-apart parallel metal bars welded to opposite sides of said web, said method comprising: installing a plurality of T-shaped spanner bar support clips at spaced-apart positions on said joists, each of said support clips being substantially aligned with at least one support clip at an adjacent joist, each of said support clips comprising a horizontal plate member adapted to be supported on the top chord by the upper surface of said spaced-apart metal bars, a vertical plate member adapted to extend between said spaced-apart metal bars into the open web portion of said joist, and aperture means in said vertical plate member to accommodate and support a spanner bar; inserting opposite ends of spanner bars into the aperture means of aligned support clips; and placing concrete form panels on said spanner bars.
Claim 3
Dependent Claim
19 words
The method according to claim 1 wherein the spanner bars are placed about 2 to about 36 inches apart.
Claim 4
Dependent Claim
15 words
The method according to claim 1 wherein the steel joists are about 4 feet apart.
Claim 5
Dependent Claim
15 words
The method according to claim 1 wherein the concrete form panels comprise 4'×8' plywood sheets.
Claim 6
Dependent Claim
111 words
Formwork for pouring a concrete slab for an integral concrete slab-open web joist structure, said open web joist comprising an open web, a top chord and a bottom chord, said top chord comprising a pair of spaced-apart parallel metal bars welded to opposite sides of said open web, said formwork comprising: (a) a plurality of aligned T-clips positioned on said joists and supported from said top chord, said T-clips comprising horizontal plate members supported by said top chord, and vertical plate members integral with said horizontal plate members and depending into said open web; (b) spanner bars supported by said T-clips; and (c) bottom form panels supported by said spanner bars.
Claim 7
Dependent Claim
111 words
Formwork for pouring a concrete slab for an integral concrete slab-open web joist structure, said open web joist comprising an open web, a top chord and a bottom chord, said top chord comprising a pair of spaced-apart parallel metal bars welded to opposite sides of said open web, said formwork comprising: (a) a plurality of aligned T-clips positioned on said joists and supported from said top chord, said T-clips comprising horizontal plate members supported by said top chord, and vertical plate members integral with said horizontal plate members and depending into said open web; (b) spanner bars supported by said T-clips; and (c) bottom form panels supported by said spanner bars.
Claim 8
Dependent Claim
17 words
The formwork of claim 5 wherein said joists are spaced apart a distance of about 4 feet.
Claim 9
Dependent Claim
28 words
The formwork of claim 5 wherein each of said T-shaped spanner bar support clips contain aperture means for supporting the end portions of at least two spanner bars.
Claim 10
Dependent Claim
15 words
The formwork of claim 5 wherein said form panels comprise 4' by 8' plywood sheets.
Claim 11
Dependent Claim
22 words
The formwork of claim 5 wherein at least one of said metal bars comprising said top chord is a round steel bar.
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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) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |