US4730424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rooftop walkway
Assignee: USG Industries Inc
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Filing: 1986-11-14
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Granted: 1988-03-15
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Expires: 2006-11-14
Abstract
Abstract A walkway on a rooftop comprises expanded metal planks supported by U-shaped support stands disposed transversely with respect to the length of the planks. The planks have alternating rows of ridges and valleys, both of which have transverse slits. The planks are connected to the support stands by T-shaped bolts whose crossbars are rounded. The shanks of the T-bolts pass through the slits in the valleys and the crossbars nestle within the valleys in rotatably slidable engagement with the metal.
Inventors
- 👤 William J. Green
- 👤 Ralph P. Semmerling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:56
CPC Classifications
E; E04; E04B; E04B7/00; E04B7/20; E04C; E04C2/00; E04C2/30; E04C2/42; E04C2/427; E04D; E04D13/00; E04D13/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
A walkway comprising a reticulated plank; a generally U-shaped support stand to which the plank is fastened transversely, said stand having a horizontal flange underlying the plank; and a plurality of T-shaped bolts connecting the plank and the flange, the crossbars of the bolts having a rounded surface in slidable engagement with the plank.
Claim 2
Dependent Claim
54 words
A walkway comprising a reticulated plank; a generally U-shaped support stand to which the plank is fastened transversely, said stand having a horizontal flange underlying the plank; and a plurality of T-shaped bolts connecting the plank and the flange, the crossbars of the bolts having a rounded surface in slidable engagement with the plank.
Claim 3
Dependent Claim
40 words
The walkway of claim 1 wherein the plank is made of expanded metal having a multiplicity of lateral slits therein and the T-shaped bolt has a threaded shank which passes through a slit and a crossbar which spans the slit.
Claim 4
Dependent Claim
51 words
The walkway of claim 2 wherein the plank has alternating rows of ridges and valleys, the slits are located in the ridges and valleys, the shank of the T-shaped bolt passes through a slit in a valley, and the crossbar is in rotatably slidable engagement with the metal in the valley.
Claim 5
Dependent Claim
17 words
The walkway of claim 3 wherein the crossbar lies below the horizontal plane defined by the ridges.
Claim 6
Dependent Claim
102 words
A walkway comprising an expanded metal plank having alternating rows of ridges and valleys, said ridges and valleys having lateral slits therein; a generally U-shaped support stand to which the plank is fastened transversely, said stand having a horizontal flange underlying the plank; and a plurality of T-shaped bolts which fasten the plank to the flange, said bolts having threaded shanks which pass through slits in the valleys and crossbars which span the slits, each of the crossbars having a rounded surface which is rotatably slidable engagement with the metal in a valley when the plank and the stand are fastened together.
Claim 7
Dependent Claim
102 words
A walkway comprising an expanded metal plank having alternating rows of ridges and valleys, said ridges and valleys having lateral slits therein; a generally U-shaped support stand to which the plank is fastened transversely, said stand having a horizontal flange underlying the plank; and a plurality of T-shaped bolts which fasten the plank to the flange, said bolts having threaded shanks which pass through slits in the valleys and crossbars which span the slits, each of the crossbars having a rounded surface which is rotatably slidable engagement with the metal in a valley when the plank and the stand are fastened together.
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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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |